Free Chlorine Low Total Chlorine Ok. Even acid rain and other biomatter getting into your pool will cause free chlorine levels to drop. You only posted a free chlorine reading which shows how much chlorine is available to kill algae.
0.02 mg/l (0.00 to 0.70 mg/l range); Combined chlorine is also known. I bought the 2gal of 10% liquid chlorine from home depot for $9.
Free chlorine can interact with chemicals, bacteria, algae, and many other particles present in pool water.
When too much chlorine is added to the water, a safe pool can become a pit of harmful chemicals. Ph is ok at 7.2, but don't let it. If you truly had a cc reading of 5, then i think you would be looking at a swamp. Yes, i would recommend raising your chlorine stabilizer to the proper level and then bring your total chlorine level up to 5ppm.
