The major ingredient in PLT is sodium bisulfate which is used in both human and animal foods. Sodium bisulfate is included in the class of compounds know as acid salts. Compared to other acid salts, Sodium Bisulfate is one of the lowest cost and safest available. It is considered non-hazardous by DOT, therefore not regulated. OSHA identifies it as an irritant and the NFPA hazard rating is 1-0-1, very low compared to other acids. If it is spilled it can be swept up, avoiding the environmental headaches associated with liquid acids.