My sister in law just had a new pool built by the same builder we used last year. She will only be a part time resident here in Florida so she will be using a pool service. The pool was filled last week (salt system) and just for fun this weekend I took my test kit to see what kind of numbers I got. FC was 0 and the pH was literally yellow. The pool builder did their pool school yesterday and did turn up the salt system to hopefully get some more chlorine going but he said that he likes new pools to have a really low pH for awhile and not to worry about it. I know he didn't say that when he did our pool. Has anyone heard of this? Is it safe to swim with a pH that low? When I put my arm in the water to take the sample it felt all dried out for hours afterwards.