pH / EC / TDS Meters & Solutions

• Professional-quality EC reference solution for TDS meter calibration.
• 500 milliliter (1 pint) bottle.

• The perfect pH adjustment solutions!
• pH Up raises the pH of plant food solutions.
• pH Down lowers the pH of the water around plant roots.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• Available in a range of sizes.

• The perfect pH adjustment solution!
• Lowers the pH of the water around plant roots.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 1 liter (1 quart) bottle.

• The perfect pH adjustment solution!
• Lowers the pH of the water around plant roots.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 4 liter (1 gallon) bottle.

• The perfect pH adjustment solution!
• Lowers the pH of the water around plant roots.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 20 liter (5 gallon) bottle.

• The perfect pH adjustment solution!
• Raises the pH of plant food solutions.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 1 liter (1 quart) bottle.

• The perfect pH adjustment solution!
• Raises the pH of plant food solutions.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 4 liter (1 gallon) bottle.

• The perfect pH adjustment solution!
• Raises the pH of plant food solutions.
• Helps your plants absorb nutrients.
• Enhances flower development.
• Works with any nutrient program.
• Provides simple and easy pH maintenance.
• 20 liter (5 gallon) bottle.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

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.

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.

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.

The acid formulation uses phosphoric acid to lower the pH to the proper level.

The acid formulation uses phosphoric acid to lower the pH to the proper level.

The acid formulation uses phosphoric acid to lower the pH to the proper level.

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 observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to expensive electronic meters because of its reliability and ease of use, which are important factors when the health of a valuable crop is at stake. Use 3 drops per 5ml of solution.

• Lowers the pH of irrigation water or nutrient solutions without adding phosphorus, nitrogen, or sulfate.
• Non-caustic.
• Non-corrosive.
• Do not need to be shipped Hazmat like other adjusters.
• Alternative to harsh mineral hydroxides.
• Triple zero HMIS score.
• Does not contribute nutritional value like other adjusters.
• Concentrated formula.

General Hydroponics® pH Down acid formulation uses phosphoric acid to lower the pH to the proper level.

• Easy pH testing with simple steps.
• Fill a test tube halfway with nutrient solution.
• Add a few drops of pH Test Indicator.
• Observe color change for pH reading.
• Preferred by experienced growers for reliability and ease of use.
• Use three drops per 5 ml of solution.