PHOSPHORIC ACID SOLUTION 45%/ 75%/ 85% Phosphoric acid as high ph acid used in acid cleaning for rust remover, metal cleaner, scale and lime remover when diluted, phosphoric acid considered as more safe to be used compared to hydrochloric acid, safe on most metals PACKAGING 16 OZ/ 32 OZ/ 64 OZ/ 128 OZ / 4 GALLON OUR PACKAGING ARE UN APPROVED, SEALED AND FRAGILE sizes are :- plastic HDPE : 16 oz, 32 oz, 64 oz, 128 oz, 5 gallon & 20 liter .