Netafim Manual Disc Filters design collects debris along the depth of the discs, not just at the surface like screen filters. 100% thermoplastic discs are corrosion resistant. Replacement filter rings are available and are color-coded for easy mesh identification. It’s extra large filtration capacity means less cleaning. Perfect for residential, commercial, municipal, and institutional applications. Manual Disc Filters are engineered for efficient operation with practically no maintenance. Plastic rings stack together creating a cylindrical filter element. During filtration, the rings are compressed together effectively filtering the water and protecting the system from clogging. Works well as a stand-alone unit or combined to form modular filter batteries.