Split off of CYA too HIGH?. JasonLion
It is my understanding, that any pool with CYA of 140 ppm would require 14 ppm of FC, just to keep algae from getting started.
At least that is considered common knowledge among thousands of pool owners and pool service people. 10% of CYA = needed FC. 14 ppm of chlorine is about 4 times the recommended level for people, especially kids should swim in. So your pool may be doing fine, but the human body, which absorbs the chlorine through the skin may not be doing as well.
Richard320 said:70 is quite usable. If you get a lot of direct sun, it's probably good.
Initially you'll need more bleach to get the FC up to the higher level, but daily consumption won't really be any different than if you had 40 ppm. My pool is doing fine despite being stuck with 140 ppm CYA.
You'll have to use the powder and drops to test instead of the color matching, that's all.
It is my understanding, that any pool with CYA of 140 ppm would require 14 ppm of FC, just to keep algae from getting started.
At least that is considered common knowledge among thousands of pool owners and pool service people. 10% of CYA = needed FC. 14 ppm of chlorine is about 4 times the recommended level for people, especially kids should swim in. So your pool may be doing fine, but the human body, which absorbs the chlorine through the skin may not be doing as well.