How To Lower Combined Chlorine In Pool. 10 gallons of 12.5% liquid chlorine added to 25,000 gallons of pool water with ammonia will lower the ta by about 22 ppm or the equivalent of adding 140 ounces of full strength 31.45% muriatic acid. Add enough chlorine to raise the chlorine level to 15% of the cya level or add an amount of chlorine that is equal to the combined chlorine level times 10, whichever is greater.
An easy why to factor the necessary amount of chlorine to shock to hit break point is to increase chlorine ppm ten times the total combined chlorine. As a rule, you will need to raise free chlorine to 10 times your combined chlorine to hit what is known as “break point.” therefore, it is good to deal with combined chlorine while it is still small.
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Brush the pool walls, stairs, and behind the ladders to remove buildup. By adding a high dose of chlorine, liquid or granular chlorine.