A complete 2-part sanitizing system for hot tubs up to 600 gallons that uses up to 75% less chlorine and has no frustrating yo-yo chlorine levels. With the built in FROG® @ease In-Line System, you simply open the cap on your hot tub, snap in the conveniently adjustable cartridges and enjoy weeks of cleaner, clearer and softer water. FROG® @ease® uses FROG® minerals and SmartChlor® Technology to kill bacteria The result is Fresh Mineral Water® Maintains a consistently low chlorine level for weeks Shock only once a month Self-regulates for continuously crystal clear water When the SmartChlor® Cartridge is depleted, the system will flip itself over as a visual reminder to replace the empty cartridge with a new one Recyclable when empty SmartChlor® Cartridges last up to 4 weeks, depending on hot tub usage Mineral Cartridge lasts 4 months or whenever you drain your hot tub Easy on hot tub surfaces with less odors Maintains a consistent 0.5-1.0 ppm free chlorine level at all times No constant monitoring No mixing chemicals EPA registered Single color match for easy reading - exclusively with FROG® @ease® Test Strips (sold separately) Kit includes: (1) Inline System: Mineral and SmartChlor® Cartridges (30) @ease® Test Strips: Easy one color match tells when the SmartChlor® Cartridge is empty - also tests for pH, Total Alkalinity and Calcium Hardness to help you maintain water balance (1) Frog Jump Start: Start-up shock for a freshly filled hot tub - effervescent action helps the shock dissolve faster This product is considered a "hazardous material," is air-restricted and cannot be shipped to Alaska or Hawaii. All Chemical sales are final.