This Kit is based around an Osmonics AK3218T low energy membrane which is housed in a 20" filter housing.Like all our kits top quality branded components are used throughout. The kit comprises:*1 off GE Osmonics AK3218TF reverse osmosis membrane*1 off Pentek No.20 2G housing with brine valve modification, bracket and spanner*2 off Pentek No.20 2G slimline housings with brackets and spanner*1 off Pentek EP10 carbon block filter, 5 micron, 20"*1 off GE Osmonics Purtrex PX05-20 sediment filter, 5 micron, 20"*2 off Pressure guages*fitting kit to connect your housings together, includes hozelock connections*1 off Hand held tds meter*Full instructions*Unlimited telephone and e-mail back-up from our engineersNote: Water should be of a potable quality. In hard water areas a water softener may be required to prolong the life of the membrane. A pressure of at least 2.5 barg is recommended. Production will vary according to water pressure and temperature (typical production rates are from 25 to 40 litres per hour). Typical rejection is 98%.