Swimming Pool & Spa Test Kit Refill Solutions, Test Water for pH, Chlorine and Bromine

The 2 standard refill solutions for pool & spa chemical test kits 1/2 ounce dropper bottle of OTO (Orthotolidine) Chlorine Test Solution 1/2 ounce dropper bottle of Phenol Red pH Test Solution The 2 standard testing solutions that are used for measuring and maintaining the proper Chlorine, Bromine and pH chemical levels in swimming pools and spas 5 drops of each solution are typically mixed in a test tube block along with pool water to check the Chloride, Bromine and pH readings