HDC® II membrane 47 mm diameter discs, 20 µm removal rating, 17 cm² EFA, pack of 25 - Products
Amazon.com: VEGEBE 20 Micron Water Filter 10" x 4.5", 10-inch Whole House Heavy Duty Sediment Pre-Filters for Well & Municipal water, Replacement Cartridge for FXHSC, W50PEHD, R50-BBSA, R30-BB, WFHDC3001, 4-Pack : Tools
pluriStrainer® 20 µm - pluriselect.com
Amazon.com: Membrane Solutions 20 Micron Sediment Water Filter Replacement Polypropylene Cartridge 10"x 2.5" for Whole House RO System, Compatible with Aqua-Pure AP110, GE FXUSC,WHKF-GD05,Culligan P5-6 Pack : Tools & Home Improvement
Whole House Sediment Pleated Water Filter, Washable Reusable, 2.5" x 1 — iFilters