Quick and Easy Hot Tub Sanitizer with minerals and up to 75% Less Chlorine! FROG @ease combines sanitizing minerals with SmartChlor® Technology to kill bacteria 2 ways. The result is Fresh Mineral Water®∞ that’s silky soft with far less odors and the easiest water to maintain because it’s self-regulating. It knows when more sanitizing power is needed and automatically delivers it. When you need to do something, it flips over. This subscription includes the @ease System box containing 2 FROG pre-filled cartridges, FROG @ease test strips, FROG Jump Start Shock , the @ease SmartChlor® 3-Pack and FROG Maintain non-chlorine maintenance shock. Each shipment provides 4 months of self-regulating sanitation for your spa We pack and ship for your convenience (never run out of FROG @ease and save time and money) Pre-filled cartridges for no mess, no guess and no stress Enjoy cleaner, clearer and softer water Maintenance made easy