No I am sure they are brominating tablets. My boyfriend bought them without consulting me so we have tried using them. My readings today are 0 chlorine again and ph, alkalinity, and stabilizer are all even lower. We brushed the entire pool and are vaccuming it, then going to add bleach but am wondering how much I should use. I seen that you want to add 3.5 cups for every 1 ppm you need to raise but with what is going on now I am wondering if I need to raise it beyond what the tests say you actually need.