Hi Larry, If I was in the city that might be the answer. I'm working off a well and have just installed a rhino filtration system in order to print. It is actually a four stage system good for about 300,000 gallons. My well pump comes on about every twelve minutes while washing. Just want to use a wash aid to reduce wear and tear on my systems. I'm going to try the Arm & Hammer suggestion and compare it to HCA. I will report my findings to the list. Sales of my black & white prints have increase dramatically over traditional color and Epson prints lately. Cordially, John