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This is a three-cartridge replacement set for iSpring whole-house filtration systems that take 4.5 x 20 inch filters. It combines a sediment stage, a carbon block stage and a carbon stage, so it covers the usual three-step job: trapping grit, cutting chlorine and taste, and polishing the water. It suits owners of a 20-inch big-blue housing who want one box for all three stages instead of buying cartridges separately. Compared with generic single cartridges, it is a matched set for iSpring housings, but it only fits systems built for 4.5 x 20 inch filters.
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Lowest price we've seen: $321.99 on Nov 13 at The Home Depot. Tracked across 3 stores since Nov 13.
This is a replacement filter pack for a 3-stage whole house water filtration system from iSpring Water Systems. The filters measure 4.5 x 20 inches.
