This is a phosphoric acid based concentrated cleaner, descaler, & brightener. Non-fuming. Removes hard water stains, soap scum, rust marks, etc. -Works with a food grade acid -Clear liquid, odorless -pH 1.5, USDA approved with A-3 rating. Sold individually by the Gallon or by the Case of 4 Gallons. THIS ITEM CANNOT BE SHIPPED VIA USPS OR FEDEX.
