Retrofit Rainwater Harvesting

Rainwater lends itself well for reuse due to being clean and clear when it falls from the sky. This means that relatively little filtration is required to make it safe for a non-potable water supply.

Rainwater is collected via the roof drainage points and into a central storage tank. Rainwater from the roof area is of the highest quality and does not contain any contaminants or pollution from vehicles, unlike rainwater collected from hard-standing surfaces.

Before entering the storage tank, rainwater passes through a pre-tank filter to remove leaf and roof debris. The pre-tank filter is rated at 1000 microns (1mm).

Rainwater enters the storage tank via a calmed inlet to prevent the disturbance of fine sediment on the base of the storage tank.

On retrofitted systems, storage tanks will be located as close to the roof drainage points as possible to minimise pipework alteration requirements.

Rainwater is then collected from the cleanest part of the storage tank via a floating suction filter and drawn through a set of submersible pumps (or a booster set on the StormStation).

An intelligent mains water top-up will operate automatically via a solenoid valve during dry spells or when there are limited rainwater supplies available. This mains water top-up is physically separated from the public water supply via a compliant air gap to prevent cross-contamination.

An option third stage of filtration can be achieved via automatic backwash filters which remove small particles to improve the quality of the rainwater supply. Learn more about this technology here.

Rainwater is then distributed to points of use around the building.

There has never been a more crucial time to consider retrofitting a rainwater harvesting system. Climate change and population growth are causing significant challenges for our water supplies. In the drier months, water scarcity is prevalent, and in the wetter months, national drainage infrastructure cannot cope with excess stormwater.

Within the last two decades, there have been many advancements in water-saving technologies, one of which is rainwater harvesting. These valuable water-saving systems can provide significant water savings by capturing rainwater from the previously underutilised roof area of a building.

Rainwater Harvesting can provide your existing building with a non-potable water management strategy, in line with your sustainability goals.

Recycled rainwater is an alternative to using precious drinking water supplies for outlets including, toilet flushing, vehicle wash down, irrigation, manufacturing, cooling, and many other applications.

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Rainwater Harvesting can provide water savings of up to 75%. On retrofitted systems, savings are highly dependent on how much rainwater can be diverted away from the drain and into the rainwater harvesting storage tank.

We provide free-of-charge desktop surveys to provide potential water-saving estimates, potential costs, and runoff savings. We can then provide a full proposal based on an in-depth site visit.

Our site visits enable you access to a rainwater harvesting expert who will consider the drainage locations, potential tank sizing, and points of use locations.

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1. Tell us your roof area, water demand, and postcode and we will complete a free-of-charge desktop survey. This service provides you with early costs, savings estimates, and sizing details.
2. Should you wish to explore rainwater harvesting further, one of our experts will attend your site to survey the building for roof drainage points, mains water connections, and points of use, and to determine where the equipment will be situated (chargeable at a small fee which is redeemable against a final order).
3. Our estimating team will provide you with accurate supply and installation costs.
4. Upon placing the order, you will receive details about our full installation process.
5. Start reusing valuable rainwater, don’t forget to maintain your system!

• UK manufactured by us! Most UK suppliers buy the same system made in Germany. For you, this means rapid access to replacement parts when components fail, unlike equivalents which take 14 weeks to be delivered from Germany!
• Unrivalled experience. As a supplier and maintenance provider who has been in the water reuse sector for over 20 years, we know what works and what does not work so well. All of this knowledge feeds into our design to provide the most robust systems.
• Our business is water reuse. That means we are solely committed to saving water through rainwater harvesting and greywater recycling.
• Quality installs. Our systems provide high levels of quality and include many fail-safe features to protect your building from a complete supply failure. Many alternatives simply do not have these important fail-safe features!