Unicel 8000 Series 100 sq. ft. Replacement Filter Cartridge for Caldera Spas | C-8399 ART1004S Allow the bag to sit

Allow the bag to sit on the stain for 24 hours

Dosage: 5 ounces / 10k gallons / week (Estimated)

When installing a replacement strainer cover

Will help remove stains and scale in older pools

inspect the underside of the filter tank for any hairline cracks or stress marks before reinstalling — a compromised tank shell above an intact new base will shorten the repair's lifespan

Unicel 8000 Series 100 sq. ft. Replacement Filter Cartridge for Caldera Spas | C-8399 ART1004S Allow the bag to sitThe Unicel C 8399 is an 8000 Series 100 sq. ft. replacement filter cartridge engineered for Caldera Spas systems. With 259 precision formed pleats of 3 oz. Reemay 2033 polyester media, this cartridge delivers the filtration surface area needed to maintain crisp, clear spa water meeting OEM specifications without compromise. Specifications Filter Area 100 sq. ft. Length 16 1 2" Outer Diameter 8" Top Inner Diameter N A Bottom Inner Diameter 3 5 8"