Finerfilters 6 Stage Domestic Reverse Osmosis Under Sink System with Diaphragm Booster Pump

Finerfilters 6 Stage Domestic Reverse Osmosis Under Sink System with Diaphragm Booster Pump


Availability: In stock

£142.99 inc. VAT
Finerfilters 6 Stage Domestic Under Sink
Reverse Osmosis System with Booster Pump


Reverse Osmosis is a technology that is used to remove the large majority (98%+) of contaminants from water. The Reverse Osmosis system works by pushing the water under pressure through a number of increasingly smaller filters and finally through a semi-permeable membrane, essentially trapping all contaminants.

Finerfilters are here to support you before and long after you buy. We provide help through manuals, easy install guides, diagrams, phone & email support.

This system produces up to 190 litres per day of purified water and comes complete with:

A 3 US gallon pressurised storage tank holding 6.5 litres of RO filtered water.

Installation Manual.

Chrome Faucet Tap.

All pipes, pre-filters, post filters, and fittings required for easy Installation.

Booster Pump with high and low pressure switches.

The membrane can last between 1 and 2 years dependent on water hardness. Filters to be replaced every six months.


Please note:

This system requires a minimum of 29 PSI (2 BAR) to work.
A minimum of 29 PSI (2 bar) is required to operate the booster pump.
Ideal pressure depends upon incoming water temperature but around 60 PSI (4 BAR) is acceptable.

Reverse Osmosis Systems waste water to make water, and this should be done at a high pressure as the water is being forced through microscopic holes which catches contaminants.

This is normal and the same with all RO systems as this is the way the membrane rejects the impure water, which goes to the drain, to produce the pure water.
The system works optimally at 80-90 PSI (5.5 – 6 bar), and to get to the quoted output, we’d recommend running the system on or around this pressure.

This allows the system to reduce the waste water to pure water ratio and work quicker at producing pure water.
As many people won’t have this mains pressure; pumped RO Systems or booster pumps can be purchased from us and added to the system which will increase the pressure output (a minimum of 29 PSI (2 bar) is required to operate the booster pump).
Please ensure that your incoming mains water pressure meets or exceeds this before purchasing.

Product Detail


Finerfilters Domestic Undersink 6 Stage Reverse Osmosis System (50 GPD)

The 6 stages of filtration are;

Stage 1

A 5 Micron Sediment Filter Made of 100% Pure Polypropylene Fibres. Removes Dirt, Sand and Rust.

Stage 2

A Granular Activated Carbon Filter Composed of High - Performance Activated Carbon. Removes Free Chlorine, Odour, Organic Contaminants, Pesticides and Chemicals.

Stage 3

A Carbon Block Filter Composed of High Performance Carbon. Removes Trihalomethanes, Pesticides, Volatile Organic Chemicals and 99.95% of Giardia and Cryptosporidium Cysts.

Stage 4

A High Rejection Thin Film Composite 50 GPD Reverse Osmosis Membrane with the Capacity to Produce up to 190 Litres of Purified Water per day. This Membrane Removes Contaminants Present in Water Including, up to 99% of Dissolved Salts, Lead, Copper, Barium, Bacterial By-Products, Oestrogen and Silica.

Stage 5

A Post Carbon Filter Designed to Improve Taste. It Removes any Residual Impurities and Odours from the Tank and Provides a Finer Conditioning of the Purified Water.

Stage 6

Remineralizing filter to enrich the water ions with health essential minerals including: Calcium, Magnesium, Potassium and Sodium.

System Measurements

6 Stage Reverse Osmosis System (No Pump)

Length 45cm
Width 26cm
Height 44cm
Weight 13kg

Pressurised Storage Tank

Diameter 26cm
Height 34cm

Approximate percentage (%) of contaminants removed by Reverse Osmosis.

Aluminium: 96 - 98

Lead: 95 - 98

Ammonium: 80 - 90

Magnesium: 93 - 98

Bacteria: 99+

Manganese: 96 - 98

Boron: 50 - 70

Mercury: 94 - 98

Bromide: 90 - 95

Nickel: 96 - 98

Cadmium: 93 - 97

Nitrate: 97 - 99

Calcium: 93 - 98

Phosphate: 95 - 98

Chlorine: 98+

Potassium: 92 - 96

Chloride: 92 - 95

Silica: 80 - 90

Chromate: 85 - 95

Silicate: 92 - 95

Copper: 96 - 98

Silver: 93 - 96

Cyanide: 85 - 95

Sodium: 92 - 98

Fluoride: 95 - 98

Sulphate: 96 - 98

Hardness: 93 - 97

Thiosulphate: 96 - 98

Iron: 96 - 98

Zinc: 96 - 98



2 Item(s)

2 Review(s)
23 April 2019
Good value
I have bought one of these units for my daughter after i had seen the difference it made to the quality of my drinking water. My kettle internals has zero scales, the internals look like a new kettle. I could only imagine the gunk i was was drinking.
16 July 2018
Very good
The ro unit is a good price and works well. Finerfilters are very helpful with any issues and will guide with any questions. I would recommend this unit.
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