The ROM-3x18 membrane is an upgrade alternative to the PENTAIR TLC-350 membrane which is supplied with the PENTAIR PRF-RO System. With two ROM-3x18 membranes incorporated into a PRF System, the high flow membranes work in series to produce on average 70% more water than the TLC-350 membrane. The design of this system also enables the concentrate from one membrane to be channelled through the second on the system, allowing waste water to be reduced by approximately 75% compared to conventional systems.