Heico Perma Wash is a highly concentrated neutral liquid that not only saves a tremendous amount of time and wash water, but even more importantly provides archival permanence in both films and papers. It's thought to save more than 90% of normal wash water requirements which is estimated that the operating cost is one cent per 8 x 10" sheet of film or paper processed. Perma Wash is non-corrosive and is formaldehyde free. Available here as case of 12 bottles. Each 1 qt bottle makes 11 gallons.