Keeping your spa water clean, clear, and balanced doesn’t have to be a chore. The Frog Ease In-Line Spa Mineral Cartridge is the ultimate solution for hot tub owners who want powerful sanitizing with minimal effort. Designed to work seamlessly with the Frog Ease SmartChlor Hot Tub Cartridge, this innovative system delivers fresh, soft, and crystal-clear water with up to 50% less chlo... https://www.poolsplusmore.com/products/frog%C2%AE-ease%C2%AE-in-line-smartchlor%C2%AE-cartridge-3-pack-for-hot-tubs