(12) 1 quart containers. Enviro-Terra™ Concentrate is a true breakthrough cleaner. With a pH of 1, this multipurpose cleaner generates the high cleaning power of an acid, yet it is safer and mild to skin like liquid dish soap. The remarkable formula contains a special blend of surfactants, organic salts and proprietary additives to create an acid-replacement cleaner that is biodegradable and safer for the environment. Highly effective against rust, calcium, scale and lime deposits, soap scum, stains and soils, hard water stains, beer stone/milk stone, scuff marks, and grease. Concentrated formula may be diluted with up to 25 parts of water or used full strength. Always rinse with water.