Water clarity is the major concern in the spas. Taking that into account, Poolfilters.biz offers Unicel C-
4401, an efficient and durable cartridge that comes with the technical specification of Pletco #
PRB17.5SF-PAIR and Filbur # FC-2386 and also complies with OEM # R173432. This cartridge has
the length of 4 5/8 inches and width of 4 15/16 inches along with 2 1/8 inch open holes at the both
top and bottom. By installing this cartridge, you will get instant water clarity results.
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