Kintillate Hot Tub Chlorine Cartridge Replacement Compatible with Frog Floating System,4 Pack Mineral Replacement Cartridges for Hot Tubs up to 600 Gallons, Smart Self-Regulating Water TreatmentBrand: Kintillate Color: 4P Features: [Universal Compatibility] Suitable for Frog Replacement Floating Systems with capacities up to 600 gallons. Compatible with Frog Mineral cartridges. [Automatic Water Treatment] Filter cartridges require no maintenance or monitoring. Each cartridge lasts 3 to 4 weeks, depending on tub size and usage frequency. Replace when the cartridge is flipped. [Easy Installation] The unique snap in design makes replacing the