A super easy and cheap way to ensure that your plants get fertilizer water with the right pH. Providing the right pH is extremely important for the health of your plants, as a too high or low pH means that various nutrients cannot be absorbed, or are poorly absorbedTherefore, if you experience problems, this is always the first step to finding out where your problem lies, as adding extra fertilizer in such a situation will not solve your problem. After you have measured your pH, you can, as needed, add pH-up or pH-down What is pH? pH is an expression of acidity.pH 7 corresponds to a neutral reaction. If pH is greater than 7 it is basic; less than 7 it is acidic.pH is an indicator of acid and base ratio.pH is indicated on a scale from 0-14. Where the value 0-1 is strong acid and alkaline base has the value 14. Both strong acid and strong base are very corrosive.