Amazon.com: 50 Micron 20 Inch x 4.5 Inch | 2-Pack Pleated Polyester Whole House Sediment Replacement Cartridge | Compatible with Watts FM-BB-50-20, Hydronix SPC-45-2050 | Made in the USA, US Water Filters :
US Water 4.5" x 20" Pleated Filter Cartridge 50 Micron – US Water Systems