This 5 micron pleated paper prefilter cartridge is designed for Rainman watermaker systems, measuring 10” x 2.5”. Performance and lifespan depend on water quality—clean ocean water may allow extended use, while sediment-heavy sources can clog the filter quickly.

Widely available and easy to replace, this cartridge helps protect system components from debris and fouling. Not to be confused with carbon filters, which restrict flow and can damage the high pressure pump.