Thanks so much, off to the pool store, we are on the same page, I like that. That is about what I was thinking myself. Son in law is working with me, but I am doing the educating, so he thought as long as clear, it was fine? I understand and did read that about algae growing and eating up the chorline with such fluctuations. We just cleaned out the pool light opening which had algae in it, yesterday. Light has been shot for years, another issue, but need to find glass plate cover to at least put that on. Thanks again for help. I have tracking no., expect it today or tom.