Because calcium scaling is such a pain to remove, it is best to stay on top of preventing it by taking the following precautions: 1 Lower your pH (7.2-7.4) and alkalinity (80-90 ppm). Yes. If calcium deposits remain on the surfaces, mix powdered water softener and warm water in a clean plastic bucket. Baking soda, borax, dish soap, toothpaste and vinegar can all be used in pretty much the same way to clean away calcium deposits, so you can use most of the information here related to vinegar and apply it to those cleaning agents as well. A pumice stone should only be used on hard surfaces, such as tile and concrete. You will usually have to remove all stain and start fresh to get a uniform look. Dampen a scrub brush with warm water and a few drops of dish detergent. Rinse the rocks and components thoroughly with a garden hose. How to Remove Calcium on Rock Waterfalls Turn off the waterfall pump and drain the water completely. Simply use the stone to scrub the deposits. 4 Inspect the rocks and tiles for remaining scaly, white residue. If your pool has calcium carbonate deposits, you can remove them with a pumice stone, stain eraser or scale remover. To remove the calcium build-up on artificial rock you are almost guaranteed to remove the stain as well, leaving a grey line instead of a white line. Companies specialize in calcium removal. Scrub the rocks and tiles with the tile brush to remove the remaining calcium deposits.