Check the listing for details. Empty Refillable Big Blue Filter Cartridge 4.5" x 20" For 20” Filter Housing. Color: White, Condition: New. Listed at 22.99 USD. Empty Refillable Big Blue Filter Cartridge 4.5" x 20" For 20” Filter Housing - Big Blue 20" x 4.5" USA 4.5" X 20" EMPTY REFILLABLE CARTRIDGE.GOOD FOR VARIOUS MEDIA DI MIXED BED RESIN SOFTENER CAUTION RESIN CARBON GAC KDF AND OTHER MEDIA/RESIN FOR WATER FILTRATIONThe Big 20" empty cartridge shell allows you to make your own customwhole house filter to treat exactly what you want in your water. Or, youcan save money and refill it after the media is exhausted several timesover. It includes the shell, seal, extra thick foam sediment pad. The filter measures 4.5-inch in diameter and 20-inch long andfits all standard 20-inch Blue housings. Cartridge will hold just under0.2 cubic feet OR about 5-6 lbs of mediaProduct FeaturesEmpty CartridgeAllows you to make your own filter OR refill the filter many times overBig Blue 20"Filter measures 20-inch long and 4.5-inch in diameterStandard Big SizeFits and is compatible with most standard 20" Big Blue filter housings0.2 cubic feetCartridge holds just under 0.2 cubic feet Track Page Views With Auctiva's FREE Counter