Free Chlorine Low Total Chlorine High. If they don't you likely have chlorine lock. Things that cause low free chlorine levels are excessive sunlight, high bather loads, and improper water chemistry.
Therefore, it is good to deal with combined chlorine while it is still small. To fix the problem, the goal is to reach a point called breakpoint chlorination. Even acid rain and other biomatter getting into your pool will cause free chlorine levels to drop.
I know that i need to bring the ph down and the ta.
If total chlorine is higher than free chlorine, there are contaminants in the pool. Subtract the free chlorine measurement from the total chlorine measurement to calculate the amount of combined. Check stabilizer (cya) at least every 6 weeks. Therefore, it is good to deal with combined chlorine while it is still small.
