CrystalClear SubLime Limescale Remover will clean deep basin pits, cracks and crevices to ensure a new appearance all year. SubLime Limescale Remover will also help to prolong the life of fountain pumps by removing limescale and calcium deposits in and around the fountain pump housing. Sublime Limescale Remover safely removes limescale and calcium deposits in all models of fountains, bubblers and water features. Its unique, gentle formula allows for use on all surfaces: ceramic, cement, plastic, resin and rock.