I bought a house with a pool. The pool was closed for at least 2 years - maybe longer. It is in ground and a vinyl liner and 21,000
gallons. It was a pond when I opened it - but have made great progress. The water is crystal clear. The bottom and sides have
green stains. I have shocked it 6 times - once doing a double (4lbs). I have used Green to Clean from Leslies. I have tried two different
algaecide. I have tried organic stain remover. I am at a loss. Any advice? See the picture below.