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What is pH? Why do I need to measure it? What do I use to measure it?

Updated: Sep 19, 2022





Potential Hydrogen, commonly known as pH, is a number that indicates the acidity (below 7.0pH) or alkalinity (above 7.0pH) of a solution.


It is important to maintain a hydroponic nutrient solution at a pH where elements in the nutrient solution are most available to the plant.

  • Each element has a pH range in which its availability is maximised.

  • In hydroponics, the range in which most elements are available is typically between 5.5pH and 6.5pH.

  • Strong acid (low pH) or strong alkali (high pH) conditions can upset the balance of a nutrient solution.

    • This can cause a loss of uptake for specific nutrients by the plants roots.

    • This is know as "lockout", whereby certain elements become unavailable to the plant due to pH.

Measure the pH of a nutrient solution daily to ensure maximum availability of nutrients to the plant, and to avoid "lockout".

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