EFFECTIVE MEMBRANE FILTRATION – The 100 GPD TFC Membrane Filter works to remove harmful contaminants that may be present in your water down to 1/10,0000 of a micron reducing lead, cysts, copper, and more. REMOVES TDS IN WATER – When water passes through the RO membrane, it removes up to 98 percent of the Total Dissolved Solids (TDS) in water. EASY TWIST IN AND OUT REPLACEMENT – The replacement membrane filter cartridge is designed to simply twist into the pivoting head of the Aquatic Life Twist-In RO and RO/DI units. TRIPLE-SEALED FOR DURABILITY – The high-quality materials used in this reverse osmosis replacement filter ensure durability. Its three o-rings ensure a tight seal for trouble-free operation. UNSURPASSED QUALITY AND SATISFACTION – AquaticLife manufactures an assortment of water filtration equipment. Every product that goes out the door meets our highest standards and quality.