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Thanks for the welcome! My post should say "HTH 6 way" not "HTH 4 way" - it includes hardness testing. That said, it registers not present for hardness. I do use FAS-DPD for FC/CC testing - even have the SpeedStir and SampleSizer. I test FC daily but did other tests as well yesterday. I got...

Hi all, I had a 4k gallon ring-top Intex for the past two years. Year one went well (apparently by sheer luck) - last year started out bad. I didn't really trust the test results and advice given at the pool store, so bought a HTH 4 way test kit and studied up on pool chemistry on the...