http://www.silverprofit.com/Catalog%202004/SilverEstimatingTest/
Apparently such strips are available. If they are cheap and accurate, this may be another option besides conductivity meters. I was looking into this for possible application with silver in a swimming pool, but no one seems to sell strips below 50ppb, which is the range most relevant to swimming pools. After reading all I can, I am setting up some buckets with a variety of experiments to see if silver citrate by itself, or in combination with peroxide can effectively maintain our swimming pool. At the moment, I am optimistic that it can, and it would only cost a few bucks per month. Will know more in month. David
