We don't have rain often here but when we do, the concrete deck around my pool leaves a white powdery residue where any puddles were and when the rainwater washes from the concrete deck it seems to get in the pool and causes the calcium to jump way up. CH in December before the rains was 450. After we have had several rains now the CH is 575.
I am assuming the rain is acidic but haven't been able to catch the rainwater to test it since it is so infrequent.
Is there some sort of treatment I can put on the pool deck to keep it from leaching calcium out of the concrete when it rains?
I am in the desert in Palm Springs, CA.