Crystal-clear sublime will deep clean basin pits, cracks and crevices to ensure a new appearance all year Round. Sublime will also help to prolong the life of fountain pumps by removing lime scale and calcium deposits in and around the pump housing. Sublime safely removes lime scale and calcium deposits in all models of fountains, bubblers and water features. Its unique, gentle formula allows for use on all substrates: ceramic, cement, plastic, resin and rock. Apply 1 ounce of sublime for every 10 gallons of water once a week.