We are about to have a tiered water billing system imposed on us here, and I am thinking my archival washing of prints may have to have some re jiggering. Right now I am using permawash and about 15 minutes of washing twice, once before the permawash and once after. I occured to me that I might be able to use a tank of say 200 gallons, which would fit under my darkroom, which is a freestanding building, and get a small pump to recirculate the water. The question: is that reasonable or dumb? also, would one test the water to see fixer levels, or merely test prints? This sounds like a photo engineer question.