Square Downpipe Filter (for square downpipes)


High Water Yield – it stands out with its impressive 90% water yield efficiency. This high performance ensures that a maximum amount of rainwater is directed into your water butt, optimising your rainwater harvesting efforts.

Effective Debris Filtration – designed to filter out moss, leaves, and debris, this downpipe filter keeps your rainwater clean and clear. By preventing these materials from entering your water butt, it ensures that the water collected is suitable for your gardening needs.

Convenient Stop Flow Function – the filter includes a stop flow function, which is particularly useful in preventing water from entering the water butt during hard frost conditions. This feature increases the longevity and dependability of your rainwater collection system by shielding your water butt and downpipe system from potential freezing damage.

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FREE Delivery by Thursday, 30 May, 2024.

SKU: 503060
Assembly Instructions


The square downpipe filter boasts an incredibly high water yield of approximately 90%! This diverter can be installed in minutes to downpipes of 50 x 50mm, 65 x 65mm and 100 x 73mm. All you need to do is saw a section of your downpipe to allow the diverter to sit comfortably in place. The downpipe filter will then filter any debris from your roof, moss, leaves, etc. and stop it from getting into your water butt. The square downpipe filter allows your to protect your water butt from a hard frost as you can stop the flow of rainwater into your water butt, thanks to the easy to use switch located on the side of the diverter.


  • Quick and easy installation
  • Recommended for roof sizes of up to 50m2
  • Suitable for Downpipe sizes 50 x 50mm, 65 x 65mm and 100 x 73mm
  • High water yield of approximately 90%



Weight 4 kg
Dimensions 105 × 135 × 120 mm

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Delivery & Returns

FREE Delivery Information

A note to our customers

All of our orders are typically delivered within 1 week from receipt of order, however during this time due to UK-wide disruption, deliveries may take a little longer and we aim to deliver within 10 days.

  • Delivery lead time is 5-7 working days on all orders.
  • Price is included to mainland UK, quotations for highlands and islands available on request.
  • We use a number of different hauliers and also deliver on our own vehicles.  We cannot currently provide a tracking number for all orders but can accept customer enquiries by phone.
  • Decorative water butt orders will be palletised curbside deliveries.  The customer being home to accept the delivery is advised but not essential.


You have 30 calendar days to return an item from the date you received it.

To be eligible for a return:

  • Your item must be unused and in the same condition that you received it.
  • Your item must be in the original packaging.
  • Your item needs to have a receipt or proof of purchase.
  • In order for returns to be approved and refunded, the returns form included in the delivery must be completed.  We can send out an additional or electronic copy of the returns form upon request.

Q&A (5)

5 Questions about Square Downpipe Filter (for square downpipes)

  1. My square down pipe is fitted flush against the wall. Will this fit, if not what would you advise?


  2. Does it come with a hose to connect to the butt?


  3. How do you connect the filter to the butt? Do you supply the drill part as like the round pipe adapter?


  4. How do you get rid of the collected debris from the filter?


    1. Hi Philippa,

      You won’t need to get rid of the debris yourself from this downpipe filter. All the debris fill fall down the downpipe into your drains, it won’t collect it for you to then get rid of.

      Thanks, Gerty