Photo: eurohydro.com
In recirculating systems the pH value should be noted on a daily basis, since the variations in the nutrient solution made from the plants themselves may cause fluctuations important.
In any case, it is essential to the measurement every time they are added to water or fertilizers.
To maintain the stable acidity can resort to the use of nutrients that provide a " cushioning effect "or buffer , and a regulation of the temperature (under 30 degrees) and humidity (over 50%) such as to reduce the 'excessive evaporation.
To make the measurement will proceed as for the EC, to mix the solution thoroughly and take a sample with a clean container.
It 's good not to take measurements immediately after the addition of fertilizers or regulators.
