Question: After every heavy rain, I find dozens of fat earthworms drowned in my pool. If I don’t vacuum them out immediately, some stick to the bottom and leave a stain that won’t brush out. How can I ...

The first step is to identify the problem. Stains in a swimming pool can be caused by metals in the water or by algae, and the best clue to the source of the problem is the colour of the stain. Almost ...