Welcome to TFP! Test strips in general are absolutely horrible for all water testing. We recommend owners use a TF-100 (link in my signature) or Taylor K-2006C to test their water. The results are night & day.
See the link below and be sure to visit out Pool Care Basics page for lots of great info. Enjoy the forum.
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Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!