Filter Kit For 5 Stage Under Sink RO System

Price range: £40.00 through £58.00 Incl. VAT

This replacement filter kit is designed specifically for use with our 5 Stage Under Sink RO System. Available with or without the RO membrane, the kit comprises of 3 pre-filters (sediment, carbon and GAC) and 1 post-filter (GAC). Changing the pre and post-filters every 12 months is recommended, with the RO membrane approximately every 36 months (depending on water quality).

Product Features
  • Bespoke filter kit for the 5 stage under sink RO system
  • Designed for drinking water RO applications
  • Easy to install push fit filter cartridges
  • Maintains system performance
Product Compatbility
This filter kit is compatible with our 5 Stage Under Sink RO System only. Unfortunately we are unable to verify compatibility with other RO systems, to ensure you choose the correct filter kit please get in touch before placing your order if you have any questions.
Help & Advice
Need help or advice on which size to choose? No problem, drop us an email, start a live chat or give us a call on 01622 933 853 and we’ll be sure to help.

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Filter Kit For 5 Stage Under Sink RO System
Filter Kit For 5 Stage Under Sink RO System
£40.00 – £58.00Price range: £40.00 through £58.00 Incl. VAT
SKU: RO-RK-SY1B Category:

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Filter Kit For 5 Stage Under Sink RO System
Filter Kit For 5 Stage Under Sink RO System
£40.00 – £58.00Price range: £40.00 through £58.00 Incl. VAT
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REPLACEMENT FILTER KIT

5 Stage Under Sink RO System (RO-SY1)

Suitable for our 5 Stage Under Sink RO System (RO-SY1) this filter kit includes all pre and post filters, with the option for a replacement membrane if required. By replacing the filters and membrane at regular intervals you can ensure optimal system performance. For specific filter change intervals please refer to the product table below, intervals specified may vary depending on usage and water quality.

How To Change The Filters?
This filter kit comprises of filter cartridges with a push fit post carbon filter. To change the filter cartridges you should first ensure the water supply to the RO system is switched off. Once the water is off, you can release the bowls of the filter housing to change the filter cartridges. For further details please refer to the product manual.

Kit ContentsChange Interval
Sediment Pre-Filter Cartridge12 Months ~
Carbon Pre-Filter Cartridge12 Months ~
GAC Pre-Filter Cartridge12 Months ~
Inline GAC Post-Filter12 Months ~
RO Membrane (50GPD)12-36 Months ~

Compatible Products:
5 Stage Under Sink RO System (RO-SY1)

Reverse Osmosis Solutions

We’re pleased to offer a comprehensive range of reverse osmosis solutions, from full systems to replacement membranes and accessories. Can’t find exactly what you’re looking for? Get in touch with a member of our team today.

Browse all Reverse Osmosis solutions →

Reverse Osmosis Solutions

Additional Information

Suitable For: No selection

5 Stage Under Sink RO System

Flow Rate: No selection

50GPD (227 Litres)

Kit Contents: No selection

Sediment Pre-Filter (10" x 2.5")
Carbon Block Filter (10" x 2.5")
GAC Filter Cartridge (2.5" x 10")
Inline Carbon Post-Filter (2" x 10")
RO Membrane (1.8" x 12" 50GPD)


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Pete Cossar
7 October 2026
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Very pleased with the service. There was an issue with the water softener I ordered initially, but then following communications made the replacement process quite pleasant. Happily recommend this company. Thanks to Becky for working with me. Great follow up support 😊😊😊
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Michael Fey
2 October 2026
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Very Pleased with the services from the Sales Team
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Guy Brennan
26 September 2026
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First time using this company and product and i wasnt dissappointed. Communication was easy and quick resulted in an easy order and now having fitted the filter i can say its a great product easy to install and appears good quality apart from the four mild steel bracket screws stainless would have been better considering the environment these are fitted. All in all, very pleased and would highly recommend .
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Graham Quinn
25 September 2026
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Easy to order and fast delivery
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Steve Griggs
14 September 2026
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Excellent local company and genuinely lovely people to deal with. Really helpful and knowledgeable, with great advice about my water softener and the correct salt to use. They even gave me some resin cleaner at no charge, which was a very kind gesture. Fantastic friendly service and I’ll definitely be returning for my salt in future. Highly recommended.
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Don Carless
7 September 2026
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Excellent service. Product proved my softener was not working as it should. I fully serviced it and cleaned with Resin Clean returned to service and it is now working as designed. Very pleased.
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J P
27 August 2026
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If you're thinking about a water softener then i HIGHLY recommend Ultra Soft Water Softeners Ltd. Great softeners and exceptional customer service. The water softener I bought needed some adjustments with the installation setup where I supported throughout. The customer service is honestly next level. I had countless calls with Becky Gillett, the Sales Manager, over a period of months to get to the bottom of it. She was incredibly patient with me, staying on the phone and doing video calls to walk me through the programming instructions step-by-step while I changed the settings and ensured all was installed correctly. All the staff here have been great, but Becky really stuck with me from start to finish to make sure it was sorted and working well. It runs like a dream now. HIGHLY recommend them!
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Chris Collins
26 August 2026
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Easy to order, good prices and delivered on time. What more can you ask for.
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John L
26 August 2026
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Good rapid & efficient service
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Tony Hybel
17 August 2026
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Easy to order, quick delivery, good communication. Resclean worked a treat; one treatment cycle and soft water is back again from our 12 yr old softener!