londoneye Posted June 7, 2013 Share Posted June 7, 2013 Hi everyone We have previously had stains on our pool steps (fibre-glass) which eventually just seem to disappear throughout the summer. This year, however, we now also have stains appearing at the bottom of the pool on the pool liner. The stains will not brush away. I am not sure if they are the same kind of stains as are on the pool steps. I tried brushing a lemon over them but nothing happened. Have also shocked the pool, ditto. The stains are brownish in colour although in some lights they look darker, almost blue - its quite hard to see as they are on bottom of pool. Stains on steps are light brown.Water test results as follows (yes, I am sorry, we do use tester strips ..... ) Total hardness - 100total chlorine - 2Free chlorine - 3pH - 6.5 (pH is always low in the pool, has always been low, seems impossible to raise it very much)Total alkalinity - 40Cyanuric acid - showing zero (!) We use multi-chlor tablets from the local pool shop. Can anyone suggest next steps to try and resolve problem please? Many thanks Link to comment Share on other sites More sharing options...
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