Rainwater Filters

A rainwater harvesting system collects, filters and stores rainwater. The water within the system is stored reliably until it can be diverted to the required place.

Filters are an important aspect of a rainwater harvesting solution. They're used to filter debris, sediment and other contaminants from rainwater before it enters the storage tank. Without filters, the rainwater can be contaminated with dirt, dust, leaves, bird droppings and other pollutants that can affect the quality of the water. 

Top-quality rainwater harvesting filters

Rainwater filters come in various types and sizes to suit your application.

Our rainwater harvesting kits for 450m² and 800m² roof areas come with a Volume Filter (VF1) rainwater filter which can be installed either within a tank or directly into the ground.

These offer a two-step cleaning process (coarse materials first, then finer materials), which means they have a high level of filtering efficiency.

With this type of rainwater filter, the cartridge is installed on a steep incline to prevent contamination – ensuring dirt is continuously washed away into the sewer.

VF1 rainwater filters are straightforward to maintain. The filter itself can be easily removed for cleaning (approximately twice a year) and doesn’t need replacing.

Our kits for 200m² roof areas incorporate a Patronen rainwater filter. Whilst rainwater flows into the filter cartridge in the same way as the VF1 filters, these can be installed within 1,250-10,000L rainwater tanks.

The filter sieve is on an inclined angle, allowing more water through than conventional filters. Once the rainwater has been cleaned, it passes through the filter and outlet, into your water tank. The dirt is washed away via the waste water outlet and enters the sewer. 

Order rainwater filters today

Here at Cotterill Civils, our rainwater harvesting filters are of exceptionally high quality.

Despite this, we pride ourselves on offering the most competitive prices, allowing you to purchase the products you need without breaking the bank. What’s more, delivery is free of charge, so you can trust that you’ll receive excellent value for money when you shop with us!

If you have any questions or can’t decide which rainwater filter is right for you, don’t hesitate to call 0121 351 3230, and we’ll happily advise you.

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Frequently Asked Questions

I don’t know which rainwater filter to choose. Can you help?

Of course! The team at Cotterill Civils know everything there is to know about rainwater filters and tanks, and we will happily assist you in selecting the most suitable one for your application. Before we offer our recommendations, we’ll take into account the size of your roof and the capacity of your storage tank, as well as your budget requirements. We’ll also talk you through the options we have available – informing you about their features and benefits. And if you have any questions regarding the different rainwater harvesting tanks we stock, feel free to ask at any time. To speak to an expert over the phone, call 0121 351 3230 today.

Are rainwater harvesting filters expensive?

You can expect to pay between £300 and £800 for a rainwater filter at Cotterill Civils, depending on the size of your roof and rainwater tank. The cheapest filters we supply can be found within our rainwater harvesting kit for smaller (200m²) roof areas and tanks between 1,250 and 10,000L. These are Patronen filters which are used within rainwater tanks, as opposed to pre-tank filters like the Volume Filter – VF1. The Patronen filter cartridge is on an inclined angle and cleans the rainwater before allowing it to flow through the calmed inlet and into the rainwater tank. Dirt, on the other hand, is quickly rinsed away into the sewer. No matter which rainwater filter you require, you can trust that we offer some of the most competitive prices around. We even offer free UK delivery across our range of rainwater harvesting filters, allowing you to keep your costs as low as possible.

How often do rainwater filters need to be maintained?

Although you should inspect your rainwater tank regularly, you’ll be pleased to hear that rainwater harvesting filters are low maintenance. For example, if you opt for a VF1 filter, you can easily remove it for cleaning. Once you’ve given it a quick clean, you can then put it back – you don’t need to change it for a new one. In-tank Patronen filters boast a self-cleaning design – helping to keep collected rainwater free from debris and sediments. They use a combination of physical and mechanical processes to trap large particles, such as twigs and leaves, whilst allowing water to pass through. For further tips and advice on how to maintain your rainwater tank and filter, don’t hesitate to get in touch with the team at Cotterill Civils. We’re always on hand to help and will gladly share our expertise.

What can filtered rainwater be used for?

Rainwater tanks collect and store rainwater which can then be filtered and used for various applications. Rainwater filters prevent dirt and debris from contaminating the water as it flows from the roof into the tank. Once the water has been filtered, it can be used in homes, businesses, public areas and industrial settings to wash clothes and vehicles, flush toilets and water lawns. Although it can be used domestically, commercially and industrially, filtered rainwater is not suitable for drinking, cooking or brushing your teeth. It will need to be purified first (ideally with a carbon filter).

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