New to PF. First of all we bought a house built in 1955 and it has an indoor pool. Many years ago I had an outside inground pool so I have a little experience our present pool is concrete which is showing quite a bit of wear. My main concern today is white stringy mold. This is the second time in 6 months. Pool store told me what to do and it seemed to work but I'm not sure if it ever really went away. Any help how to get rid of it?