20″ Big Blue LimeScale Reducing Water Filter Cartridge 4.5″×20″ – Slow Phos Poly
Fits allstandard 4.5″×20″ Big Blue housings. Key Features. Replace every 4–6 months (varies by water quality).
Fits allstandard 4.5″×20″ Big Blue housings. Key Features. Replace every 4–6 months (varies by water quality).