Hello Everyone – just registered. I’ve got a problem that I hope someone can help me with. I’ve had my in ground pool for 15 years. Two years ago I replaced my liner with a thicker gauge liner and have been happy with it until now.
Early this summer I noticed what appear to be algae at first, but when I tried to sweep it away it would not disappear. I know its not algae. It continues to expand – more like a shadow or grey (but transparent) stain. It’s only on the bottom of the pool not the walls or the steps. It’s very hard to see on a sunny day but looks terrible on a cloudy day. My chemical levels are perfect. What could it be?
I just called my installer who has suggested that it is algae growing under the liner. But this liner is an extra thick gauge – I can’t believe algae could seep through!
Are there any pool owners out there with a similar problem and how can I fix it short of ripping the liner out?