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

WinterPill® clarifies the pool water and helps reduce scaling and staining during your winter months

and its Class B Insulation prevents meltdowns caused by overheating

Verify your spa's manufacture date before ordering

Prevents calcium and mineral staining

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