I don't know what kind of test system the pool store used. They are an AquaBan store. They used a test strip that they dipped in the water, then put on a little tray that slid into a machine that came up with the readings. There were no small plastic vials with powdered reagents.

Their test also said that I have no more algae, which I am not sure is accurate either. All I know is that the appearance of my water has remained basicly unchanged for two weeks, in spite of everything I have done to correct it. It has been a little less cloudy a day or two but when I brush the pool it stirs everything up off the bottom and sides and the water becomes totally dark and cloudy again. It doesn't seem to get filtered out or cleared up by exposing it to more CL.