Calibration Solutions

General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and ob...

*Uses food-grade phosphoric acid to lower the pH to the proper level. To maximize plant growth, the pH content of your nutrients should be slightly...

*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 ...

General Hydroponics pH Control Kit contains 8 oz of GH pH Up, 8 oz GH pH Down, 1 oz of the GH pH Test Indicator and a test vial. GH pH Up - Add a ...