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GAPS Water Treatment 10 Stock Close, Rochdale, Lancashire, OL12 6BB, United Kingdom.

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e-mail: sales@gapswater.co.uk

Create your own reverse osmosis kit

Build your reverse osmosis kit

Our reverse osmosis kits are built around quality components and simplicity of design.

Why make it simple?
Most of our customers will be running off tap pressure so the least amount of components and pipework maximises the pressure to your membrane.

Why is pressure important?
The more pressure you have the better the quality of the water from your membrane and the higher the flow rate. By getting the best possible performance out of your membrane you extend the life of your resin and bring your running costs down.


Below we start with membrane selection, followed by pre-filtration, then fitting kits. At each stage of selection we'll give you the benefits and disadvantages of each option.

Membrane Selection

Membrane Selection

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HF5-4040 374.50 Excluding VAT HF4-4040 337.50 Excluding VAT AK90 395.50 Excluding VAT
HF5-4021 317.50 Excluding VAT HF4-4021 307.50 Excluding VAT HF5-4014 287.50 Excluding VAT

Pre Filtration Selection

Pre Filtration Selection

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1 57.80 Excluding VAT 2 94.80 Excluding VAT 3 91.80 Excluding VAT 4 146.50 Excluding VAT

Single membrane fitting kit

Single membrane fitting kit


Price: 39.00 (46.80 Including VAT at 20%)

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Twin membrane fitting kit

Twin membrane fitting kit


Price: 59.00 (70.80 Including VAT at 20%)

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Twin retro fitting kit

Twin retro fitting kit


Price: 32.00 (38.40 Including VAT at 20%)

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Hand held TDS meter

Hand held TDS meter


Price: 17.00 (20.40 Including VAT at 20%)

15mm x 15mm x 1/2

15mm x 15mm x 1/2" Tee with stop valve


Price: 13.50 (16.20 Including VAT at 20%)

John Guest 1/2

John Guest 1/2" push fit to 3/4" BSPF - PI451616CS


Price: 5.00 (6.00 Including VAT at 20%)

John Guest 1/2

John Guest 1/2" push fit to 1/2" BSPT - PI011604S


Price: 2.70 (3.24 Including VAT at 20%)

John Guest 1/2

John Guest 1/2" BSPT to 1/2" stem - PI051604S


Price: 1.50 (1.80 Including VAT at 20%)

John Guest 1/2

John Guest 1/2" Equal elbow - PI0316S


Price: 2.90 (3.48 Including VAT at 20%)

John Guest Equal 1/2

John Guest Equal 1/2" Tee - PI0216S


Price: 3.35 (4.02 Including VAT at 20%)

John Guest shut off valve (long handle) 1/2

John Guest shut off valve (long handle) 1/2" pusf fit - PISV0416S


Price: 10.50 (12.60 Including VAT at 20%)

Plastic nipple 1/2

Plastic nipple 1/2" BSPT x 1/2" BSPT


Price: 0.50 (0.60 Including VAT at 20%)

Plastic nipple 3/4

Plastic nipple 3/4" BSPT x 3/4" BSPT


Price: 0.75 (0.90 Including VAT at 20%)

John Guest 1/2

John Guest 1/2" Pipe (1 metre)


Price: 1.50 (1.80 Including VAT at 20%)

Inline pressure guage

Inline pressure guage


Price: 17.00 (20.40 Including VAT at 20%)

Pressure Gauge, 0 to 100 psi (0 to 6.8 bar) 1/4

Pressure Gauge, 0 to 100 psi (0 to 6.8 bar) 1/4" thread


Price: 12.00 (14.40 Including VAT at 20%)

SPECTRUM countdown timer

SPECTRUM countdown timer


Price: 6.00 (7.20 Including VAT at 20%)

DI Kit with 1/2

DI Kit with 1/2" fittings

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6" x 18", 8 litres 129.00 Excluding VAT
8" x 17", 12 litres 134.00 Excluding VAT
8" x 22", 16 litres 137.00 Excluding VAT
8" x 35", 28 litres 146.00 Excluding VAT

DI Kit with hozelock style fittings

DI Kit with hozelock style fittings

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6" x 18", 8 litres 121.00 Excluding VAT
8" x 17", 12 litres 126.00 Excluding VAT
8" x 22", 16 litres 129.00 Excluding VAT
8" x 35", 28 litres 138.00 Excluding VAT

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