4 Pack Hot Tub Chlorine Cartridges Replacement for Frog Ease Floating System,Each Cartridge Lasts 3 to 4 Weeks，Perfect for Hot Tubs 200 gallons to 600 gallons

["Compatible & Convenient – Designed for Frog Replacement Floating System, ideal for hot tubs from 200 gallons to 600 gallons","Effortless Maintenance – Self-regulating cartridges last 3–4 weeks with no monitoring needed, adapting to your hot tub’s usage","Smart Chlorine Release – Patented formula adds chlorine only when necessary, keeping levels low and gentle","Gentler on Skin & Surfaces – Uses up to 75% less chlorine, reducing irritation and protecting swimwear, skin, and hot tub materials","Simpler Water Care – Shock just once a month (or after refilling), saving time and hassle compared to frequent treatments"]