Unicel 4000 Series 10 sq. ft. Replacement Filter Cartridge | C-4310 Pool Test Kits & Labs This listing includes 2 cartridges

This listing includes 2 cartridges — the full quantity needed for one complete filter service

Verify your spa's manufacture date before ordering

and its Class B Insulation prevents meltdowns caused by overheating

Prevents calcium and mineral staining

The Pentair 170018 is the OEM replacement tank bottom assembly (lower housing half) for the FNS Plus 60 sq

Unicel 4000 Series 10 sq. ft. Replacement Filter Cartridge | C-4310 Pool Test Kits & Labs This listing includes 2 cartridgesThe Unicel 4000 Series C 4310 is a 10 sq. ft. replacement filter cartridge engineered for compact skimmer and spa filtration systems. With 216 precision pleated folds of 3 oz. Reemay 2033 polyester media, it delivers maximum surface area and water clarity in a small footprint housing a direct OEM grade replacement backed by Unicel's industry leading compatibility database. Specifications Filter Area 10 sq. ft. Length 4" Outer Diameter 4 1 4" Top Inner