Disc Filter technology has grooves in the disc rings that crisscross to form a network that traps debris between and on the outside of the discs. As dirty water is pumped into the filter and pressure increases, the water compresses the disc rings together tightly. The water is then forced to flow through the grooves of the disc rings, where debris is trapped; releasing only clean water to the irrigation system. The Netafim Disc Filters offer a wide selection of flow ranges; 3/4 in filter operates at 1 - 12 GPM; 1 in filter operates at 5 - 26 GPM, 1.5 in super filter operates at 10 - 52 GPM.