Hot Spring Freshwater Salt Water Test Strips - For use with Freshwater Salt System / ACE Sanitising System and other Salt Systems!\nTest the salt levels of the water in your hot tub. Test for sodium chlorine/salinity. \n25 strips in the pack. \n\nGreat for customers using the ACE Salt Water Sanitizing System, Freshwater Salt System or equivalent Salt Water Hot Tub systems. \n\nFormally Watkins part 76771.\nInstructions:\nDip strip into hot tub and immerse for 2 seconds. Remove strip with pad face up. DO NOT SHAKE OFF EXCESS WATER. \nIn shade, hold strip level for 20 seconds and compare to colour chart. Discard after 30 seconds. \n--Keep out of direct sunlight during testing\n--Keep wet fingers out of the bottle\n--Close cap tightly after removing strip.\n--Store indoors in a cool, dry, dark place.\nWhy Happy Hot Tubs?\n\n--Family-run business with over 30 years experience in the hot tub industry. \n--Great customer serv!