In these days of home pools and hot tubs, there should be a reasonably cheap and accurate test for chlorine. The water in Newport News, VA had much chlorine. I used it for photographic work I did for the Norfolk and Peninsula Symphonies and the Old Dominion University Ballet without problem. I didn't realize how bad it was until I had been here in rural WV where the worst thing my well water contains is calcium, and went back to my old house for a night or two. The chlorine in the drinking water was so strong I didn't want to wash my face in it. Chlorides are a different matter and are certainly to be avoided in certain photographic activities, but my experience
Originally Posted by greybeard
at trying to use sodium chloride to reduce grain a la Microdol (they say) was that it took quite a lot to make a difference in practical photography.