Rainwater Harvesting Diverters & Filters

How to Filter Rainwater from a Roof

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When you collect water from your roof it is important to ensure that it is filtered before it is stored in water tanks so that it is as clean as possible and doesn't go sour or smelly before you use it.

This article explores the four main components you need if you want to use the rainwater in non-potable situations in a professional Rainwater Harvesting System, whether the water is stored in an above ground tank or one buried in the ground. (Extra steps will need to be taken if you want to further filter the rainwater for drinking). Read about the four steps of Rainwater Harvesting.

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  • In-Tank Rainwater Filter - Compact Garden Filter showing the stainless steel filter in the housing. Colour: Blue.

    In-Tank Rainwater Filter - Compact Garden Filter

    £235.50 Inc. VAT
    £196.25 Ex. VAT
    Water Tank Filter for Roof areas up to 150m2 Rainwater filter for installation in rainwater tanks as part of a rainwater harvesting filter system. This simple filter from 3P Technik is ideal where...
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    £235.50 Inc. VAT
    £196.25 Ex. VAT
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  • ZF In-tank Rainwater Filter.

    In-Tank Rainwater Filter - Zisternenfilter - Blue

    £281.22 Inc. VAT
    £234.35 Ex. VAT
    Water Tank Filter for Roof areas up to 200m2 Rainwater filter for installation in rainwater tanks as part of a rainwater harvesting filter system. This quality filter from 3P Technik has two cleaning...
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    £281.22 Inc. VAT
    £234.35 Ex. VAT
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  • 3P Technik Volume Filter for Rainwater Harvesting from roof area up to 450m2.

    Volume Filter for Roofs up to 450m2

    £339.00 Inc. VAT
    £282.50 Ex. VAT
    VF1 Water Tank Filter for Roof areas up to 450m2 Rainwater filter for installation before a rainwater storage tank in the ground. Also often used in river intake systems as the filter is...
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    £339.00 Inc. VAT
    £282.50 Ex. VAT
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  • VF1 Combi Rainwater Harvesting Filter. Note the outlet to the Water Storage Tank is at the base of the Unit

    Volume Filter Combi for Roofs up to 450m2

    £339.00 Inc. VAT
    £282.50 Ex. VAT
    VF1 Combi Water Tank Filter for Roof areas up to 450m2 Rainwater filter for installation either before a rainwater storage tank in the ground or within the rainwater tank. The position of the Water...
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    £339.00 Inc. VAT
    £282.50 Ex. VAT
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  • Patronen Filter for filtering Rainwater inside a water storage tank.

    In-Tank Rainwater Filter - Patronenfilter

    £265.00 Inc. VAT
    £220.83 Ex. VAT
    Water Tank Filter for Roof areas up to 200m2 Rainwater filter for installation in rainwater tanks as part of a rainwater harvesting filter system. This quality filter from 3P Technik has a stainless...
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    £265.00 Inc. VAT
    £220.83 Ex. VAT
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  • Rainwater diverter for push-fit downpipe connection to sealed water butts (Built)

    Downpipe Filter and Diverter - U32 - Grey - Push Fit (Sealed Tanks)

    £49.50 Inc. VAT
    £41.25 Ex. VAT
    Rainwater Diverter Kit with Push-Fit Tank Connector for Sealed Tanks – Grey The market-leading 3P Filter Collector is supplied with our exclusive Push-Fit Universal Fitting Kit for straightforward...
    Qty in Cart: 0
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    £49.50 Inc. VAT
    £41.25 Ex. VAT
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  • ZF Zisternenfilter in Black (side view)

    In-Tank Rainwater Filter - Zisternenfilter - Black

    £281.22 Inc. VAT
    £234.35 Ex. VAT
    Water Tank Filter for Roof areas up to 200m2 Rainwater filter for installation in rainwater tanks as part of a rainwater harvesting filter system. This quality filter from 3P Technik has two cleaning...
    Qty in Cart: 0
    Quantity:
    Price:
    £281.22 Inc. VAT
    £234.35 Ex. VAT
    Subtotal:
  • Rainwater diverter for push-fit downpipe connection to sealed water butts (Built)

    Downpipe Filter and Diverter - U32 - Black - Push Fit (Sealed Tanks)

    £49.50 Inc. VAT
    £41.25 Ex. VAT
    Rainwater Diverter Kit with Push-Fit Tank Connector for Sealed Tanks – Black The market-leading 3P Filter Collector is supplied with our exclusive Push-Fit Universal Fitting Kit for straightforward...
    Qty in Cart: 0
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    Price:
    £49.50 Inc. VAT
    £41.25 Ex. VAT
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  • Siphon Filter - combined Filter and Overflow Siphon for Rainwater Harvesting Tanks.
    Sale 58%
    Sale 58%

    Siphon Filter

    £150.00 Inc. VAT
    £355.00
    RRP: £355.00
    £125.00 Ex. VAT
    £295.83
    RRP: £295.83
    Combined Rainwater Tank Filter and Overflow Siphon The Siphon Filter is a compact rainwater filter with an in-built Overflow Siphon for installation in a concrete or plastic rainwater tanks. Ideal...
    Qty in Cart: 0
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    Price:
    £150.00 Inc. VAT
    £355.00
    RRP: £355.00
    £125.00 Ex. VAT
    £295.83
    RRP: £295.83
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  • Mono Overflow Siphon for thick walled Rainwater Tanks.

    Mono Overflow Siphon

    £73.25 Inc. VAT
    £61.04 Ex. VAT
    Mono Overflow Siphon for thicker walled Rainwater Harvesting Tanks The Mono Overflow Siphon design includes a rodent and odour barrier. It is best used in thicker walled rainwater harvesting tanks...
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    £73.25 Inc. VAT
    £61.04 Ex. VAT
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  • 3P Retention Filter with integrated Stainless Steel dirt retention basket for roof areas up to 800m2.

    Retention Filter for Roofs up to 800m2

    £825.00 Inc. VAT
    £687.50 Ex. VAT
    Soakaway/Infiltration Crate SuDS Filter for Roof areas up to 800m2 Rainwater Retention Filter to 45l/sec max flow. For installation before storm tanks and flow control chambers. This 3P Technik...
    Qty in Cart: 0
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    £825.00 Inc. VAT
    £687.50 Ex. VAT
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  • Rainwater diverter for push-fit downpipe connection to sealed water butts (Components)

    Downpipe Filter and Diverter - U32 - Brown - Push Fit (Sealed Tanks)

    £49.50 Inc. VAT
    £41.25 Ex. VAT
    Rainwater Diverter Kit with Push-Fit Tank Connector for Sealed Tanks – Brown The market-leading 3P Filter Collector is supplied with our exclusive Push-Fit Universal Fitting Kit for straightforward...
    Qty in Cart: 0
    Quantity:
    Price:
    £49.50 Inc. VAT
    £41.25 Ex. VAT
    Subtotal:
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Celtic Water is a trading style of Celtic Sustainables Limited. Celtic Sustainables Limited is a company registered in England and Wales with company number 4071622 and registered office at Unit 3 Parc Teifi, Cardigan, Ceredigion, SA43 1EW.