CrystalClear, 8 OZ Sublime Cleaner, Deep Cleans Basin Pits, Cracks & Crevices To Ensure A New Appearance All Year Round, Helps To Prolong The Life Of Fountain Pumps By Removing Limescale & Calcium Deposits In & Around The Pump Housing, Keeping Pumps & Lines Free Flowing, Safely Removes Limescale & Calcium Deposits In All Models Of Fountains, Bubblers & Water Features, Its Unique, Gentle Formula Allows For Use On All Substrates: Ceramic, Cement, Plastic, Resin & Rock.