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![BIG BLUE 4.5 X 20" CATION RESIN WATER FILTER/CARTRIDGE](http://titanwaterpro.com/cdn/shop/products/2045b_f79dbf17-ab32-48a5-ac16-1cd2f45233d5_{width}x.jpg?v=1566796183)
BIG BLUE 4.5 X 20" CATION RESIN WATER FILTER CARTRIDGE
FOR HARDNESS REDUCTION (SOFTENER) SOFTENING FILTER (20" x 4.5") Fits Big Blue Housings 20" x 4.5" with Softener Resin 10% Crosslink