I just purchased a house that has a pool and haven't any experience other than what I have been reading here.
I read in the Water Balance for SWGs topic in the pool school that CYA level should be kept at 70 - 80 and mine is about 35.
When I went to the local Leslies to purchase the CYA to add to raise the level, he recommended that I keep it at the lower level. His reasons were that since we are in the desert with daily temps in the 120's the pool water will routinely get to 100 degrees.
He said that because of the high water temperature we have to keep our CYA lower or it will cause the calcium to build up on the surfaces. We have very high levels of calcium in our water. Mine is currently at 590.
Does this sound right?