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test strips This is kind of off the subject but I noticed that there is talk about test strips. Doesn't anyone like them? I also bought a digital tester that tests chlorine, PH and ALK. Thoughts?

We have a small pool route - about 114 pools. Two of our pools that we acquired from someone else have a dark black ring which is in the steps along the tile line and along the top of the walls - again where the tile meets the plaster. We were told that it is called "hydration". Would anyone...