Aquatic Life twist-in color changing deionization filter cartridge: replace when the resin color changes completely. After the water is filtered by a membrane (not included), there is usually a small amount of total dissolved solids (tds) left in the water. In certain non-drinking water applications, it is important to remove the remaining tds from the water. This is accomplished by filtering the water through a resin that is charged with cation and anion resins (H+ and oh-). as the resin absorbs the tds, it will change color. When the entire resin has changed color, it is time to replace the di cartridge. The new twist-in media cartridge design makes filter changes simple, easy and clean no tools required and no mess! the twist-in cartridges can be easily changed in only seconds with just a quarter turn and without contact with used filter material. It is important the cartridges are installed post membrane filter to prolong the life of the deionization cartridge. Working pressure: minimum 35 psi, maximum 80 psi, ideal 65 psi.
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