Mr. Clean’s Durafoam Magic Eraser looka like a sponge and can be helpful cleaning dirt around skimmers and scum lines on pools. Questions often arise if the Magic Eraser is safe to use around pools.
The Magic Eraser is melamine foam. Basically they work as an extremely mild abrasive to remove the top layer of whatever they rub against when they're wet. Think super-fine sandpaper.
Precautions
If you are going to use the Magic Eraser on a vinyl liner it should be tested in a small out of the way spot to make sure it doesn't damage the liner.