Check the listing for details. RT ENTERPRISES Stain Eraser For Calcium, Rust and Mineral Pool Stains. Condition: New. Listed at 31.49 USD. Use the Stain Eraser to Remove Unsightly Mineral Stains Without Using Chemicals Watch stains in your pool disappear with this stain eraser that works much like a pencil eraser. With this useful stain eraser, you can quickly and easily remove most types of stains from your pool, without the use of additional harsh chemicals. Just a few of the stains that can be removed with this must-have tool include calcium, scale, rust and other deposits. This innovative tool is compact and can be attached to a standard telepole so you can easily reach stains anywhere in your pool. You can also use it by hand to take care of smaller stains scattered about your pool's surface. Stain Eraser for pools is made from surface-safe polymer Features a mild, built-in .