I was gone for the weekend and when I came back I had green algae on the bottom of the pool. I tried a shock treatment and used some algicide, but nothing has worked. I can't drain the pool because we are on a water restiction right now due to drought. the pool is not very big, we bought it at wal-mart. it's one that you air up the top ring and the water make it rise. does anyone know what i should do?