25 Micron Filter Pentek CW-MF 30 Micron String Wound Water Lot Of 8 & Housing | Bullseye Sediment Filter Pentek -DGD-2501 Dual Gradient Sediment Water Filter Pentek PD-25-934, 25 Micron 10 Inch Grooved Water Filter Sale $9.98 The material in the WP-BB Cartridges is a fibrous polypropylene media wound in a precise pattern around a polypropylene core, providing greater surface area to maintain high flow rates. Suitable for a wide range of sediment applications including municipal and well water, and are chemical resistant so they can be used with many industrial fluids The PENTEK-WP25BB97P is wound in a precise pattern around a polypropylene core providing greater surface area and filter depth increases the ability to trap granular sediment.