Netafim Manual Disc Filter, 1 Inch, 40 Mesh (DF100-040)A full selection of highly efficient manual disc filters to clean any water source. Netafim disc filters collect debris along the depth of the discs, not just at the surface like screen filters. The disc helps filtration with calcium buildup. 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