Hi, I really need help. I'm only 14, and it's up to me to keep my pool clean because my dad died about a year and a half ago and I'm not quite sure on what to do. So the water is clean with perfect chlorine and acid levels, but a few years ago it was a complete swamp. When we got it clean, the water was fine, I was able to scrub most of the algae away, although the walls were kind of stained a light yellowish color. It was worst around the steps. But it seems to slowly be getting worse no matter how much i scrub and I really need to know how to fix it. I have looked at other post with similar questions but I don't really understand what to do. Can some please tell me what to do in words that an average 14 year old will be able to understand?