Category Archives: Rainwater Harvesting


Grey Water Recycling: Going Green to Save Your Business

When the chair of a company like Nestle tells a newspaper like the Financial Times that the looming international water crisis is ‘much more urgent than climate change,’ it’s time to sit up and take notice. After all, these are highly regarded institutions that are hardly renowned for buying into the hysteria of environmental fringe groups. The reality is, the British economy is going to be hit hard by this looming crisis, and it’s those businesses that start using water-recycling methods now that are most likely to survive in the long run. For larger business, grey water recycling is the most effective method of sustainably harvesting this natural resource. As you’ll see, grey water recycling is also as simple as it is effective.

grey water recyclingBuilt for Big Business

Grey water recycling is perfect if you’re operating a large business, as the large number of people associated with such businesses will be using a lot of the water that you’ll recycle. If you’re the landlord of a large residential block or are running a hotel, leisure centre or large office block, you’ll get the most out of grey water recycling.

How It Worksgrey water recycling

Grey water recycling takes the water used in baths and showers for other purposes such as flushing toilets and irrigating gardens. It does this by collecting the water in an aeration tank that encourages the natural cleansing of biodegradable particles. An ultra-filtration system catches the remaining particles and sends the clean water into a separate tank. This clean water is then pumped to a water management system and onto its final destination.

How You Save Money

The immediate way you save money is by reducing your water consumption by up to 40%, which can be a staggering sum if you’re running a multi-storey operation. More importantly, ROI on a good grey water recycling system, such as those approved by Waterscan, can be achieved in as little as 2.5 years. This is due to the low energy output of the grey water recycling system itself, which currently sits at 2KwH per m³ or £0.24 per m³ in financial terms.

grey water recycling Eligible for Enhanced Capital Allowances (ECAs)

Waterscan’s approved grey water recycling equipment is on the Government’s Water Technology List. The associated ECAs allow you to claim 100% of your first year capital gains allowances on your grey water recycling system. Ultimately, this means you can write of the entire investment against taxable profits during the period in which you make your investment in a grey water recycling system.

Being environmentally conscientious is a matter of survival that also reaps dividends in the short term. Waterscan have been roundly applauded by such Government bodies as DEFRA and are therefore the strategic water management partner you should consider to ensure you have a sustainable business in the future.


Rainwater Harvesting: Harnessing Nature for a Sustainable Future

If peak oil was the cry of environmentalists throughout the 2000s, peak water will become the cry of the last half of the 2010s. While it seems unthinkable that Britain could run out of water, the fact is that much of what is produced in the UK requires inordinate amounts of it. However, it’s not only industry that’s diminishing Britain’s water supply. Global warming is also having an impact, as is the population boom. With Britain’s crop production and agricultural economy facing the potential of catastrophic failure, the time is now for businesses to seek sustainable water solutions. This is where rainwater harvesting comes in.

How Rainwater Harvesting Works rainwater harvesting

Incredibly, the process of rainwater harvesting is so simple, it’s amazing Britain hasn’t been doing so for decades. Rain collects on the roof, travels down a pipe, and passes through a filter. This filter ensures no large particles of debris make it to the central part of the tank. Once filtered, the clean water enters an inlet where the flow is calmed to prevent further debris from being distributed. As the tank fills, a floating extraction system pumps the cleanest filtered water back into your building for non-potable use.

Conserving Energy in Multiple Ways

One of the most impressive features of a high quality rainwater harvesting system is that it costs very little to run. The best systems operate a dual pump, generating 20% less energy than inferior rainwater harvesting systems. At the same time, your rainwater harvesting system can save your business up to 75% on its potable water bills, if employed as part of an overall water management project. Mains water consumption may also be reduced by up to 30%.

Intelligent Monitoring

It’s nice to see how much water and money you’re saving while you’re looking after the planet, and rainwater harvesting systems come complete with a remote monitoring system. This means you can check your water consumption at any time and pay attention to any sudden spikes in water usage. You’ll also be the first to know if there is a fault with your rainwater harvesting system, as it comes with alarms that will alert you if any part of the system fails or even if it needs a clean. In any case, you’ll never run out of water as your rainwater harvesting system will automatically switch to your mains supply if the water level gets too low. In essence you’ll be guaranteed good quality water without fail.

Eco-Friendly on the Outsiderainwater harvesting

Impressively, it’s not only the internal working of the best rainwater harvesting systems that are kind to the environment, but their cladding and installation. The tanks are steel reinforced and custom-built for each installation. This makes them chemical resistant and extremely durable. Rotatable drainage turrets and ducting connections keep weight light, allowing for quick and easy installation. This results in a tank that requires 25 times less concrete than standard tanks, resulting in a reduced carbon footprint from the outset.

Looking After Your Wallet While Looking After the Environmentrainwater harvesting

If you think looking after the environment comes at a price, you’ll be surprised at how profitable your rainwater harvesting system will become. Purchasing a WaterManager rainwater harvesting system from Waterscan will immediately entitle you to Enhanced Capital Allowances through DEFRA. Combine these tax breaks with the reduction in water bills mentioned above, and wrap these up with an impressive ROI on the system itself, and you’ll be looking after the planet while you laugh your way to the bank.

As Britain heads toward a future defined by water shortages, it’s the businesses that become sustainable now that will benefit in the future. A rainwater harvesting system is simple, efficient, financially prudent, and futureproofed. It’s highly likely more companies will be using them as time goes on. Getting in on the ground floor would be a very wise move indeed.


Modern Water Management Systems

As the planet gets drier, and water becomes precious, it’s nice to know there are enterprising, ecologically aware businesses offering the latest in greywater recycling and rainwater harvesting systems. Water sustainability is something everybody will need to look into sooner or later, so there’s no better time than now to familiarise yourself with how these systems work.

water management

How Much Water Is Your Business Wasting?

Before looking at water management systems, it’s best to look at your current water management. Start with a professional water audit, whereby qualified technicians will inform you of how much water you’re using and where it is being discharged. You may have a leak you’re unaware of, faulty equipment, or unjustified water expenses from your supplier. Even if you have none of these things, you can still save a lot of money with a water management system.

Do You Have A Water Strategy?

All good businesses have Corporate Social Responsibility (CSR) targets, but many are unsure how to add water management to the equation. A good water strategy should assess financial, operational, reputational, and regulatory risks and

offer water management solutions to suit. There are some practical tools that can be implemented, and experts who know how to use them. If you’re conducting a review of your CSR targets, you’re doing your business a disservice by not looking at water management.

Could You Need a Rainwater Harvesting System?

water management

This naturally depends on the nature of your business, but with potential savings of 75% on potable water bills and opportunities to reduce mains water consumption by 30%, it’s worth thinking about. Rainwater harvesting systems take rainwater from the roof of you

r building, filter it, house it in storage tanks, and redirect it for uses such as flushing toilets, running cooling systems, irrigating land, and num

erous other solutions. The storage tanks require less concrete upon installation, are largely self-cleaning, use very little energy, and offer a speedy return on investment (ROI).

Could You Need a Greywater Recycling System?

If you run a large complex such as a hotel, leisure centre, office building, or residential block the answer is probably yes. These systems reduce mains water consumption by as much as 40%, while only costing £0.24 to run per m³. As well as incorporating rainwater harvesting system, greywater recycling systems takes water from showers and baths. This water is subject to natural aeration and a membrane to remove biodegradable particles, before the clean, green water is repurposed for laundry facilities, toilets, and similar applications. The entire system can be managed remotely and ROI can be achieved in 2.5 years.


The Future of Rainwater Harvesting Systems

It’s easy to think of the UK drenched in rain. However, with only 2,440m³ of water available per head of population, and a majority of people living in areas off just 600-800mm of rainfall per year, Britain suffers from an acute water shortage, and this is predicted to get worse. A rainwater harvesting system should be your first line of defence against water shortages, so let’s take a look at the future of rainwater harvesting.

What Is the Impact of Rainwater Harvesting?

rainwater harvesting

Rainwater harvesting systems can currently reduce mains water consumption by 30%, and prototype systems are often developed with a view toward further reductions. With further population growth expected in the UK, especially in the South East, logic dictates that rainwater harvesting systems will become the norm for domestic and commercial users alike. This demand for systems will also increase if South East England experiences extended periods of decreased rainfall, as predicted by climate change analysts.

What Do Future Rainwater Harvesting Systems Need to Do?

The future dictates that rainwater harvesting systems will need to be easy to retrofit, make use of water-storage space, eliminate the need for fossil fuel-driven pumping technology, offer protection against flooding, and be reliable. Business models for the en-masse provision of systems could include system leases and maintenance contracts, while a paradigm shift for consumers can be provided through authoritative Government leadership.

Are There Any New System Ideas in the Works?

rainwater harvestingMany prototypes are being trialled that could pave the way for future rainwater harvesting. Modular, DIY systems that are reusable and recyclable are one example. There are also simple wall-mounted systems, and systems that collect rainwater runoff, part way down the roof, and deposit it in storage tanks hidden in the eaves. Many prototypes attempt to incorporate green spaces with water conservation through storage tanks that house a variety of plants.

Will Current Rainwater Harvesting Systems Work in the Future?

If you’re concerned that future rainwater harvesting systems will render current ones obsolete, there’s no need to worry. The current system of rainwater collection, filtration, extraction, and pumping is clean, green, energy-efficient, and easy to maintain. This automatically meets much of the criteria expected from future systems. Choosing a tank that has strong chemical resistance will future-proof your system significantly. Future savings are also guaranteed, as long as you choose a product listed on DEFRA’s water technology list.

While there are developments afoot in the field of rainwater harvesting, there are still systems that will meet the need for future demand. By all means, look at what the future has to offer, but don’t let that dissuade you from investing in a rainwater harvesting system now.


Water Management

Climatic uncertainty threatens the reliability and quality of water supply, so management strategies that secure water supplies have become a high priority in the public and private sectors. Rebecca Gale of Waterscan Ltd. explains various approaches that have reduced water use and maximized available supplies.

Water management strategy to minimize corporate risk

Climate change has been a hot topic over the last decade, as extreme weather events have increased around the world. Temperatures have risen, glaciers have melted, ecosystems are out of sync, and weather events have become more frequent and more intense. In 2007 alone, monsoons caused floods in South Asia that displaced an estimated 20 million people, heavy rain in China killed 66 people in flooding and landslides, and the United Kingdom (UK) floods cost the economy US$5.3 billion, according to BBC News.

Climatic uncertainty threatens the reliability and quality of a continuous water supply, which is imperative to industry. Before devising a water management plan, all risks – operational, reputational, regulatory, and financial – should be analyzed to ensure a robust strategy, with a collaborative approach to a shared problem.

Operational risk can be either a direct physical risk to a business, an indirect risk from an unsustainable supply chain, or both. Using flooding as an example, a flooded site’s indirect risk is the potential loss of revenue if the site cannot operate, while the direct risk is associated with the expenditure required to repair flood damage. In times of water scarcity, the operational risk to a business is that production will cease, stores won’t open, and employees cannot work.

Reputational risk encompasses the customer experience and the public’s view of the company’s brand. It is more imperative now for a company to have a good corporate social responsibility policy. Consumers are becoming increasingly aware of the environmental implications of products they buy and seek to purchase goods from ethical companies. In 2004, protesters in Kerala, India, accused Coca Cola of depleting the groundwater and polluting the local environment, which led to the shutdown of their plant.

Coca Cola denied these allegations, but the brand in this region was irrefutably damaged. Since then, the company has been carrying out one of the most sophisticated corporate social responsibility global water strategies in the beverage industry.

Regulatory risk encapsulates current and future local water regulations and legislation surrounding water supply and wastewater. Failing to meet these requirements can lead to the termination of the business’s water supply or large fines for environmental degradation. In China, between 2008 and 2009, there were 8,179 legal disputes on water-related issues. In 2010, a mine belonging to the Zijin Mining Group leaked 9,100 cubic meters of contaminated wastewater from the plant into the Ting River. Thousands of fish were poisoned, drinking water was affected, and operations were suspended. The company was fined $4.5 million and the five employees directly responsible were fined and imprisoned.

The financial risk to business is the accumulation of the operational, reputational, and regulatory risks, and is often the driving force behind a business seeking to mitigate their water risk. Companies can be fined millions of dollars for non-compliance with regulations, and loss of revenue from operational and reputational risks can also be substantial amounts. The other financial risk a business can face is the potential increase in supply or wastewater company charges, plus abstraction and discharge licences.

Compared to the financial implications of the other risks, the price of water does not currently reflect its true value. It is anticipated that water will be treated more like a commodity in the future, much like oil.

Water measurement

Good water management begins with measurement and transparency. Adapting to climate change, mitigating water risks, and effective water management is about knowing how much water is being used, where and when, and then setting priorities on where water reductions can occur – this is referred to as water footprinting.









A water footprint of a business is defined as “the total volume of freshwater that is used directly or indirectly to run and support the business,” according to the Water Footprint Network (WFN). A water footprint is divided down into many subsections. For example operational, supply chain, product, and end-use water footprints are subsections, which are further broken down into blue, green, and grey waters. Blue water refers to the consumption of surface or groundwater. Green water refers to the consumption of rainwater that does not become runoff. Greywater is an indicator of pollution.

Operational water management


To optimize water resources within a business, initially it is better to look at operational water consumption as the company has a direct influence over reductions. The best way to monitor a business’s water consumption is through automated meter reading. Irregular and estimated water company charging systems provide poor data if the site is billed at all. Data loggers monitor consumption from revenue and sub meters and provide remote meter readings up to every 15 minutes. Unusual patterns in water consumption and leakage can then be immediately identified and rectified.



The success of any water management project can be evaluated using this accurate data. For Whitbread’s Premier Inn hotel chain in the United Kingdom, the automated meter reading identified peaks in consumption at approximately 11 am that was caused by inefficient housekeeping practices, which led to a preventable wastage of water. Whitbread also saved $665,700 identifying and stopping 11 major leaks.


Water-efficient technology

Successful water management is about identifying and prioritizing significant high-water consumption and reducing it to a best-practice benchmark. Full water audits of sites can show where technologies need maintenance, where processes and behaviors are inefficient, and where water reductions can be made.

Automated meter readings can monitor savings to determine which technologies are the most effective in terms of water consumption savings and return on investment, before implementing the technology solutions across the whole portfolio. Changes to employee and customer behaviors are the most challenging, but often the cheapest way to save water. However, many technologies available in the market generate significant water savings with an impressive return on investment.

All water points should be considered for improvements. For example, hotels that install low-flow showerheads and taps, and dual-flush toilets, and encourage guests to wash towels only when necessary, can significantly reduce the water use per room. Premier Inn saved approximately 500,000 cubic meters (m3) of water per year by installing low-flow showerheads in 40,000 rooms throughout its hotels. In companies where there is a high level of domestic water use, such as offices, considerable savings can be made through urinal controls and generally the return on investment is evident within a few months. For Sainsbury’s Supermarkets Limited in the UK, the annual water saving from urinal controls and new-build waterless urinals amounted to 50,310 m3.

Rainwater harvesting and water recycling

rainwater harvesting systemsRecycling water creates a sustainable, dependable, and controllable source of supply, which is essential for business stability. It reduces the pressure on less renewable sources, such as groundwater and surface water, which is needed for continued ecosystem functioning. Furthermore, potable water is not used for non-potable applications, which reduces the supply energy cost per cubic meter.

All rainwater harvesting systems work on the basis of using rainwater as their primary source of water, with mains water as a backup source. When accounting for rainwater-harvesting water use as part of the water footprint assessment, rainwater is considered blue water – simply because it would have eventually become run-off if it was not captured by the system. Even though blue water is less sustainable than green water, the use of rainwater is more sustainable than surface or groundwater, and is a useful means of reducing the demand on mains water. It can also act as a preventative measure of surface water flooding due to the improved management of surface water runoff. The supply of water is dependent on rainfall, so regions that are water stressed, due to a lack of rainfall, are not suited to this technology.

Rainfall replenishes other sources of water, so by collecting the water it is no longer available for other users. Installations need to be analyzed on a case-by-case basis – for their effect on the local watershed, the increased carbon cost, and the benefit to the site. Systems vary from the basic water butts for irrigation, which require no treatment, to systems for non-potable water use, and systems that filter the water to potable water standard.


Rainwater harvesting should not be a substitution for other water efficiency measures. All cost-effective technology should be implemented before alternative supplies are considered. Rainwater harvesting does not reduce water consumption, but water efficiencies will.

Unlike rainwater harvesting, greywater recycling saves mains water regardless of external environmental factors and reduces water consumption within a business more consistently. Greywater recycling reuses water used in baths, showers, and hand basins, for use in flushing toilets and irrigating gardens. Therefore, it is suited for installation in buildings, like hotels, that have the potential to meet a significant proportion of domestic demand for water. Greywater is generally installed in new-builds since retrofitting a system is costly and ineffective. Many greywater systems have an increased energy cost due to the ultraviolet disinfection used to treat the water. Some systems are designed to use less energy, and instead of using ultraviolet they use an ultra-membrane filtration technology. A cost-benefit analysis should be carried out to see if the system will meet the demand, produce a shortfall, or would have water stagnant in the tank. Premier Inn installs greywater systems in all newly constructed properties, which can reduce water consumption in hotels by 40 percent.

Bespoke recycling

Operational water use can be reduced to almost zero in most industrial systems. Bespoke recycling systems, custom-designed for specific processes, can reuse significant volumes of water. Located in the UK, Walkers Crisps (PepsiCo) plans to stop water intake at all manufacturing sites in the next 10 years by capturing, treating, and reusing water extracted from potatoes during slicing and frying.


Sustainable drainage systems (SuDS). All new buildings in the UK have a mandatory requirement for sustainable drainage where feasible over conventional drainage. The reason is to retain surface water runoff on site and release it at a controlled rate. SuDS are designed to reduce the potential effect of new and existing developments on surface water drainage discharges. Urbanization has caused areas of vegetation to be replaced with impermeable surfaces that do not have the ability to absorb rainwater, which overloads the drains and causes flooding. These drainage systems aim to replicate natural systems to drain away dirty water run off through collection, storage, and cleaning, before slowly releasing it back to the environment. They should be easy to manage, require very little energy input, be resilient to use, and should be environmentally and aesthetically attractive. They should also use the following techniques: source control, permeable paving, water detention, infiltration, and evapotranspiration. This water can be recycled for use in buildings by using underground attenuation tanks for storage.


Holistic water management maximizes available water resources on a large scale beyond one company’s needs. Water management should focus on the allocation of water on an equitable basis to satisfy all demands in a catchment area. Businesses share similar water issues, such as availability and quality, but each water management approach should be unique depending on its location and water-consuming processes employed. Water reduction and efficiency is the first step towards achieving water stewardship, and the influences and drivers can be varied for each regional area.

Historically, business’ overuse of water had minimal effect on global water resources. However, businesses cannot afford to ignore the potential risks that can occur from the lack of understanding of their water use, its effect on the local catchment, and of the importance of a strategy to reduce freshwater dependency.

Numerous water management strategies can be implemented to suit different businesses. Every saving made is a step closer to a more sustainable water environment, not just for the business, but also for the local community.

Case Study

Sainsbury’s Supermarkets Limited achieved a relative reduction in their water use through an operational water management strategy that included installing automated meter reads, efficiency measures, rainwater harvesting and bespoke recycling.

Due to the company’s commitment to sustainability and corporate social responsibility, a target of 50 percent relative reduction against sales area, compared to a 2005-2006 baseline, was set.

This strategy has saved one billion litres of water compared to the baseline. Annual savings from some of the water-saving techniques implemented include: pre-rinse spray taps that saved 29,000 m3, remedial works that saved 119,064 m3, urinal controls that saved 50,310 m3, shared supply that saved 50,000 m3, account analysis that saved 147,000 m3, and rainwater harvesting RWH at Sainsbury’s Swansea saved 1,300 m3.

All new stores aim to be 50 percent more efficient than the baseline year, and install a suite of water-efficient technologies and rainwater harvesting systems as standard.

Sainsbury’s aims to be the UK’s greenest grocer, and has consequently opened two new stores that are water-neutral. The UK Environment Agency and government define water neutrality as no net increase in water use after a development in a pre-defined area, which encompasses the new development and surrounding area.

The company reduced water consumption at the Leicester and Weymouth stores as much as possible before offsetting the remaining water used in the stores in the local community.







The Many Benefits of Rainwater Harvesting Systems

rainwater harvesting systemsMore and more businesses are discovering the benefits of rainwater harvesting. Rainwater harvesting is an indispensable water saving tool in a climate where groundwater isn’t as plentiful as people might think. Water resources in the UK are in short supply, especially when factoring in changes in rainfall patterns and population growth. Through harvesting, rainwater is collected, commonly from large roof spaces and stored in underground tanks for use at a later time. This helps us to reduce our reliance on and consumption of mains water (the water that comes out of your tap).

 It is not a new practice for people to harvest rainwater in some way, yet the need to do so is becoming greater and greater. Climate change has contributed to increased exposure around rainwater harvesting systems and the benefits of their use. Various government and charitable authorities are also encouraging people and businesses to reduce their consumption of water, specifically mains water. Rainwater is also free from various pollutants, and although mains water has been treated, harvested rainwater is more than sufficient for various business uses such as toilet flushing, cleaning processes, irrigation, car washing and cooling water processes.

Expect Less Wastage

75% of the planet is made of water, yet much of this cannot be used for practical purposes. This means that there is a real shortage of water that we can use for various applications. The principles of rainwater harvesting are not complex. It is a system that collects, stores, filters and conveys rainwater; with the equipment required being easy to maintain.

Harvesting rainwater helps us to stop wasting drinkable mains water for applications that don’t need that level of purity. The process of harvesting rainwater can reduce mains water consumption by up to 50%, which has a huge impact on water bills.

Carbon Footprint Reduction

Businesses can run up sizeable bills and have an increased carbon and environmental impact when relying on mains water, which is one reason more and more companies are getting in touch with Waterscan for the provision of harvesting systems. The systems available from Waterscan are designed, built and installed to site requirements.

Waterscan has supplied equipment to offices, schools, hospitals and various other businesses, with the rainwater being used for an array of different purposes on these sites. Increasing workplace awareness of rainwater harvesting can also encourage staff – and students – to reduce their reliance on mains water.More and more homeowners and businesses are discovering rainwater harvesting.