FROG @Ease Test Strips for Hot Tubs and Swim Spas - Test Strip with Out Indicator for FROG @Ease SmartChlor Cartridges, pH, Total Alkalinity and Total Hardness - 60 Test StripsBrand: FROG Features: Compatible with FROG @ease Systems: FROG @ease Test Strips are only compatible with FROG @ease sanitizing systems; works for both hot tubs and swim spas Unique SmartChlor Test Kit: FROG @ease Test Strips are specially designed to test for SmartChlor and are much easier to use than other test strips; one color match shows when the FROG @ease SmartChlor Cartridge needs to be replaced Test Strips for Home Spa: In seconds, you can