CX SERIES: CX Series systems are hydrants. Never run out of water again! A complete line of commercial water filtration ranging from 4,000 GPD all the way to 21,000 GPD. Need more flow? Buy two and have operational redundancy, safeguarding against maintenance downtime. Recycling is a standard feature on every CX Series model. It is a fluid circuit topology that routes the drain water from the membrane stack back through the membranes again for another pass?often called a "second pass" system. Recycling allows for reverse system ratios such as 1 part drain to 4 parts purified water. The circuit contains a stainless needle valve and precision flow meter to adjust the dynamics.