How often must components be replaced?
This varies depending upon demand and water conditions. As a rule of thumb, the sediment prefilter cartridge should be replaced every 4 months. The sediment filter works from the inside to the outside. When discoloration is visible it is time to replace it. Some ro filters feature a uv resistant clear sump housing which allows cartridge condition to be checked at a glance. The carbon block prefilter should be replaced every 6 months. Keeping the sediment filter clean protects the carbon block from clogging. As filters become exhausted, system efficiency and ro water output declines. The membrane replacement schedule is variable. On a drinking water filter the average life is three years. On a system used in aquaria the time is shorter due to the higher usage. Membrane life can be prolonged by using a membrane back flush valve. This is explained in the paragraph above. If filter output sharply declines even with new prefilter cartridges, it is time for a membrane replacement. The harder
