OTO Test Reagent #1 (1 ounce)

• This replaces the OTO solution on all test kits that are using oto
• This is the solution that is in all 4 or 5 way test kits
• For 2 way use 1/2 oz or buy this and refill twice

 Note: Never add drops of OTO directly to the water in the pool. -- OTO is poisonous, hazardous chemical. Do not add to water that humans will touch. Doing so will also give false high readings. To demonstrate the possible error, run a standard chlorine test in the test tube provided in the test kit. Hold the tube and look down through it. The color is many times more concentrated than if you look through the side. This erroneous, concentrated color is what is observed if drops of OTO are added directly to the pool or spa.