Watts Premier 202134 20-Micron Full Flow Pleated Sediment Replacement Cartridge Effectively reduces sand, silt, sediment, rust and dirt Pleated filter manufactured using durable polyester for exceptional strength and filter durability 20 micron sediment filter Large capacity filter suitable for high flow applications Compatible with Watts 213089 and 213057 housings, as well as other whole-house filter housings that accept 9.5 by 4.5-Inch filters