Howdy Sessan, I mix up my nutrients a little different than most. I first get the water pH down to 6.0 (or very close to) and the add the nutrients and supplements into one gallon jug (I use old, but clean, milk jugs). Then I check the pH and bring it back to 6.0 using pH Down. I have been doing it this way for several grows now as I am using dry nutrients (GH MaxiGrow and MaxiBloom) and they dissolve better in the slightly acidic lower pH range, 6.0 as to out of the tap at 7.0. When I feed, I pour in the nutrient mix and five more gallons of already pH'ed water to fill the reservoir. As the plant's root ball gets larger, the amount of water needed to top off the reservoir is reduced and by adding plain (pH'ed to 6.0) after the nutrient mix, I do not waste any of the nutrients by mixing up six individual gallons of mix.