Low Pressure membrane-operates from 20 psi to 120 psi. 1st Stage – Replace every 6 months-2nd Stage – membrane replace 3 – 5 years, (upon water quality)-3rd Stage Carbon Neutralising, replace every 12 months. 1/ Weight 1.59 kgs. (Dry) Length 34cm-Compressed width 15cm Tank height 34cm Tank diameter 23cm 2/ pH neutral final carbon filter, RO water can produce acidic water, low pH. This filter coconut carbon for taste & odour with pH neutralising calcite marble. From this safe pH neutral fresh healthy water. 3/ Final carbon filter, water passed through negative magnetic field & activates the water.