Taylor1401, 4-in-1 Pool and Spa Test Strips for Free Chlorine, pH, Total Alkalinity, & Cyanuric Acid, 50 Test Strips, Quick & Easy Water Testing | Made in The USA

Taylor S-1401, 4-in-1 Pool and Spa Test Strips for Free Chlorine, pH, Total Alkalinity, & Cyanuric Acid, 50 Test Strips, Quick & Easy Water Testing | Made in The USA

EASYTEST 7-Way Pool Test Strips, 150 Strips Water Chemical Testing for Hot tub and Spa, Accurate Test Bromine, Total Alkalinity, pH, Free Chlorine, Total Hardness, Cyanuric Acid, and Total Chlorine

Taylor K-1005 DPD, 9-in-1 Pool Test Kit for Test Kit for Free & Total Chlorine, Bromine, pH, Acid & Base Demand, Total Alkalinity, Calcium Hardness, Cyanuric Acid | Made in The USA