I'm so jealous of my neighbors in the spring. They take their cover off and their water is clear and blue with some dirt on the bottom. I take my cover off and it is thick with green algae. I have to slam $$$ and it's a weeks time battling the green goo before I can actually use my pool. What am I maybe doing wrong that my neighbors are not? I tried closing later, opening sooner, slamming before putting the cover on for the winter and nothing seems to make a difference. Please help