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Instructions for Changing your RO Membrane

Fitting Instructions for Reverse Osmosis Membrane

Product code: MEM-RO

Thank you again for your order. Please follow the instructions below carefully.

Video instructions available here

Before starting this is a good time to first sterlise your Reverse Osmosis system.


(Useful things to have nearby – 1. A cloth for any slight leakage 2. A pair of pliers to grasp the membrane)

1) Close the Saddle Valve and the Tank Valve then drain the system and empty the tank

2) Open the sinktop Tap/ Faucet to relieve system pressure

3) Take out any supply tube at the cap end of the membrane housing unit.

4) Un-screw the membrane filter housing cap - taking care not to lose the rubber o-ring. Sometimes the o-rings can drop out.

5) Remove the existing membrane using pliers if necessary.


6) Insert your new membrane with the two small black o-rings entering first.

7) Replace cap and supply tube

8) Turn off the sinktop Tap/ Faucet tap

9) Open tank valve

10) Open saddle valve to restart the water supply.

Refill Tank and Flush

11) Let the tank refill (this can take a couple of hours - depending on your local water pressure)

CAUTION: new filters must be flushed out before use. Discard all the water made in the first two tank fills. (Fill the tank then leave the Faucet / Tap open until the storage tank drains. Then refill tank. Repeat).


Any Problems? Please Telephone 020 8761 6611

Important Note re Reminders

To avoid long term bacteria build-up it is important to change or disconnect your water filter on time.

Your MEM-RO membrane should last three years - depending on local water quality

Your other four filters (the two prefilters and two post filters) should be changed every six months.

We will email you reminders when it's to change, but please make sure you whitelist our email address so these reminders aren't sent to spam.

And/ or set an alarm now on your mobile or use Siri etc

Please note your feedback and any suggestions as to how we can improve our service are always appreciated.


Thank you

Sales Admin Team
Telephone 020 8761 6611

Water Filter instructions / Guides for fitting and installing


Need advice?
Please call us on
020 8761 6611


UK Water Filters Ltd
Unit D120
Parkhall Industrial Centre
SE21 8DE

UK Water Filters Ltd a Company Limited by Guarantee,
Registered in England,
Company Number: 05249436,
VAT Reg. No. 863 7634 91


Questions? Call us for friendly advice
+44 (0) 20 8761 6611




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