Hot Tub Cartridge Compatible with Frog Ease Floating System Replacement for SPA Cartridges, Up to 600 Gallons, 3PackBrand: Welliboom Color: Gray Features: Hot Tub Replacement Cartridges: Designed to be replacement for Frog Ease floating system cartridges, perfect for hot tubs up to 600 gallons Each Cartridge Use 3 4 Weeks: The hot tub replacement cartridges does not require maintenance or monitoring. Each cartridge can last for 3 to 4 weeks, depending on the size of your hot tub and the frequency of use Replacement Reminder: Just replace hot tub when it is flipped,