I have a vinyl liner pool that is badly stained, yellow/green looking. The odd thing I see reading about stains is, wherever I had leaves or other debris on the pool bottom, the liner is perfectly clear, but everything else, including the sides is stained. A similar problem a couple of years ago cleared up by using the 3-in-one chlorine tablets. No such luck so far with that. Any suggestions as to where to start? My pool is approximately 25,000 gallons.
Thanks - Ed