Free Chlorine Low Total Chlorine High. Even acid rain and other biomatter getting into your pool will cause free chlorine levels to drop. Notably, the high combined chlorine level in a pool may cause a.
Were improving i guess, fc was at 10 for 3 days. At this level, there is enough free chlorine in the water to neutralize all the chloramines in the water. If your total chlorine is higher than your free chlorine, that means you have combined chlorine and something is eating your chlorine up (algae, organic matter, pee, etc).
To fix the problem, the goal is to reach a point called breakpoint chlorination.
If they don't you likely have chlorine lock. As you know it's very low and you should be adding chlorine asap to get this up. Subtract the free chlorine measurement from the total chlorine measurement to calculate the amount of combined. You need to raise your pool to shock levels (10ppm+) and hold it there overnight to burn off your combined chlorine, kill the.