All Clear Professional Pool and Spa OTO 4-Way Test Kit

All Clear 4 way OTO test kit. OTO kits test for Chlorine/Bromine. OTO Test Kits use a liquid chemical OTO (orthotolidine) and is a reliable method for checking the presence of chlorine

• Tests for Chlorine, pH, Acid Demand, and Total Alkalinity.
• Reagents are 1/2 and 1 ounce bottles
• Reagents: 1 ounce bottles of OTO No. 1 and No. 2, 3 and 1/2 ounce bottles of No. 4 and 5