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The acid formulation uses food-grade phosphoric acid to lower the pH to the proper level.
GH pH Up Liquid Gallon (4/Cs)
$17.67 $29.24
Bluelab pH Pen
$78.10 $116.00
GH pH Down Liquid Gallon (4/Cs)
Bluelab pH Probe KCI Storage Solution 250ml (6/Cs)
$14.52 $20.00