The most difficult pool stains occur in in-ground plaster pools. The best way to get rid of them is to not get them in the first place. Some stains come from leaves, sticks, and other organic materials. However, the greatest percentage and the most difficult ones are from decaying worms. Worms get into your…
If you have reddish-brown stains in your in-ground plaster pool, they’re probably from worms that get into the pool over the winter and end up at the bottom in the deepest end, where there is less light and it’s warmer. The problem is that they can’t get out, but they also cannot breathe down…