Free Chlorine Low Total Chlorine Normal. Sometimes, you find the free chlorine level becomes lower, and the total chlorine level increases. So according to the poolmath calculator i put in about 81oz of 10% liquid chlorine which was a little more than half the gallon.
The pool and hot tub alliance recommends keeping free chlorine levels between 2.0 and 4.0 parts per million (ppm). Free chlorine is the amount of chlorine present in chlorinated water that is available—or free, that is—to combine with that chlorinated water. I have a 18 foot round pool and i seem to be having chlorine demand i test the water and i get no chlorine reading i took a sample to a local pool store and they said my total chlorine was at around a 3 and my free was at 0 my ph and alkalinity reading are fine my cya is a little high at 80 but it read that last year and didn’t have this problem i added powder chlorine and then.
Your total chlorine level is high (and your free chlorine is low) but ineffective due to a “chlorine lock”, which happens when too much cyanuric acid is added to the pool.
However, if your free chlorine reading is different. Free chlorine isn’t interacting with contaminants, yet. My chlorine reading using the original kit shows ideal to high and the ph ideal. Per 10,000 gallons of water to neutralize 1ppm of chlorine.