With a technology as unique as FROG @ease, it only makes sense it would have a unique test strip. FROG® @ease® Test Strips let you know when your SmartChlor® Cartridge is empty. A simple Go/No Go Out indicator for SmartChlor® makes testing your hot tub fast and easy. 30 test strips per container For use ONLY with the @ease® Floating or In-Line Sanitizing Systems Quick and easy - just dip the strip in the water, shake and get an accurate reading in 2 seconds If the SmartChlor® color on the strip is darker than the bottle label, the water is fine If the color on the strip is lighter then that means it's time to replace the SmartChlor® Cartridge Also tests for pH, Total Alkalinity and Hardness Regular test strips will read a low free chlorine level and a high total chlorine level which normally means it's time to shock With FROG® @ease®, it means the product is self-regulating perfectly to meet the sanitizing needs of your hot tub and no action is required