Properly establishing and regularly monitoring the levels of potential hydrogen (pH) and electrical conductivity (EC) of the nutrient solution allows plants to have at their disposal the full range of macro and micronutrients present in the fertilizer used. An incorrect pH level will cause plants to show nutrient deficiencies that are present in their culture medium but can not absorb them, leading many growers to think that using mono nutrients will solve the problem. This is a mistake that can harm the plant by saturating the fertilizer medium. The EC must be adequate to the state of development of the plant. The Essentials range from Vitalink offers us the necessary products to correct the pH of the water and to keep the digital meters well calibrated.