Compact 4 Stage RO Water Filter With DI Stage

Reverse osmosis water filter system with 4 stages of filtration including a DI resin stage and colour change resin.

£49.99 £41.66
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Compact reverse osmosis water filter system, a 4 stage filtration unit including a DI resin stage. The filter includes a sediment pre-filter, RO membrane, GAC post filter, final resin stage and colour change resin, with all fittings needed to connect up the unit.

Reverse osmosis, alongside the correct carbon filtration process, can remove chemicals from your water, such as chlorine and chloramine as well as most other total dissolved solids that normally come out of your tap. This process also removes any odours and tastes that have been caused by contaminants and chemicals.

This reverse osmosis water filter, like all unpumped reverse osmosis water filters, does rely on you having a strong mains water pressure. Please do not buy this item if you do not have a good water pressure, other pumped systems are more suitable. This unit operates best as input water pressures of between 30 - 60 psi (2 - 4 bar). We would suggest that this is not suitable for use with gravity fed unpumped cold water system (where the water is stored in the loft). Normal UK water pressure should be from around 2 bar and above.


  • 4 stage filtration system
  • Stage 1 - Sediment filter - 10" 5 micron wound PP sediment filter
  • Stage 2 - Carbon post filter - 10" granular activated carbon filter
  • Stage 3 - 50gpd RO membrane - 50 (US) gallon per day reverse osmosis membrane
  • Stage 4 - Resin stage - 380ml mixed bed colour change DI resin
  • Connecting pipes
  • 3/4" outside tap/washing machine connection
  • Mixed bed resin

Filter Life

Dependent upon usage of the unit the 2 cartridge filters will need changing every 6 months, the membrane filter requires changing at approximately 12 - 36 months. The life of the reverse osmosis membrane, is affected by the following factors, bacterial contamination (not changing pre-filters often enough), chlorine contamination of the membrane, (again, by not changing pre-filters often enough) and the worst culprit, hard water.

We are regularly asked why we say our membranes may need changing at 18 months or less, when other sellers quote their membranes will last 3 years. We call it honest genuine expectations; our membranes are made to the same, and in many cases higher specification than reverse osmosis membranes from other manufacturers. If you have very soft water, or using the RO system on the output of a domestic water softener, then yes you can expect a life of around 3 years. If used with a rainwater harvesting system, you could expect longer, as you do not have a chlorine loading in the water you are filtering.

This products housings are made from heavy duty food grade plastics casings. The filters are manufactured by a quality ISO 9001 company a member of the Water Quality Association of America. This unit will provide you with tap water tasting as good as it gets.

There are a number of factors that affect the output of reverse osmosis water filters, such as input water pressure, TDS of input water, bacterial film on RO membranes (if they are not changed regularly) and water temperature, especially in winter months. Based on UK water conditions, you can expect to get approximately 50% of the membrane's rated capacity.

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