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Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml Trimbag to have a built in easy to have a built in easy to see water level meter then add the concentrated nutrients one by one Bluelab recommend that the solutions are de cantered into a smaller vessel and the contents discarded when the calibration process has been completed a must in every grower's toolbox
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