Trac Ecological Descaler Fresh Water Scale Remover Gallon #202-1204MC Ready To Use. All TRAC's products are 100% biodegradable safe and completely non-toxic. Designed specifically for fresh and brackish water applications TRAC Descaler can safely be used within engines cooling towers boilers or just about any other systems re-circulating water. TRAC Descaler will not harm gaskets seals plastics or any metals commonly found in water systems. Will not harm most materials including plastic metal rubber fiberglass vinyl wood or paint. One gallon of Descaler Concentrate will make 5 to 10 gallons of ready-to-use solution.