When you prefer hydroponics and total control, 100% HYDRO products are the ones you should use. As a grower you are responsible for for your pH values yourself and you determine your nutrient values yourself. You can very accurately meet your specific plant requirements, that is why the 100% HYDRO grow style is recommended only for experienced growers. You have to have experience in measuring pH values, calibrating pH meters and adjusting the pH of your nutrient tank. This also applies for the EC- level. You are responsible yourself and should be able to work with an EC-meter.