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  1. C

    First the black stain in the deep end and then the green water

    My friend came over with his TF-100 test kit and these are the results: Chl 5.5 Comb Chl 0.5 Calcium Hardness 325 Total Alkalinity 100 pH 7.8 CYA 35 Thank you for your help!
  2. C

    First the black stain in the deep end and then the green water

    I am new here. Never again to the pool supply store. Last night I used my test strip and the pH and all other readings were within an acceptable range. Two weeks ago I went to the pool supply store about the 3' x 1' black stain only in the deep end. They told me it was organic and to put in...
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