Kohler Aquifer Filter Cartridge Replacement
Kohler Aquifer replacement filter cartridge (Kohler K-200-F, $50--$70): 750-gallon life, approximately 6 months for a family of 4. Annual cost: $100--$140 for two cartridges. Available at Kohler dealers, Home Depot (online and in-store), and Amazon. The Kohler Aquifer uses a proprietary multi-stage cartridge -- standard carbon block replacements do not fit the Aquifer housing. Kohler shower filter replacement cartridge: Kohler KDF filter insert (K-9245, $15--$25) -- fits all Exhale shower filter models. Replace every 10,000 gallons. Both products available through Kohler's website with a manufacturer satisfaction guarantee.