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This Base solution is formulated using potassium hydroxide and potassium carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level.
GH pH Up Liquid Gallon (4/Cs)
Bluelab pH Pen
GH pH Down Liquid Gallon (4/Cs)
Bluelab pH Probe KCI Storage Solution 250ml (6/Cs)