hy-dro-pon-ics = soiless agriculture; the raising of plants in nutrient mineral solutions without EARTH around the roots.

Pro-Mix used in a container and feed via the nutrient solution IS hydroponics.
Whether you hand water, set up an automated top feed (drip system) or place the containers in a grow tray (sometimes called a flood table) and bottom feed (ebb & flow) to reuse nutrients....it's all hydroponics.

Suggested PH by the mfg. is 5.9, but check and see what your nutrient mfg suggests. Dutch Master recomends 6.0 for Pro-Mix. (not a big difference)

BTW Pro-Mix is one of the few growing mediums that do not require cal/mag to be added even if using RO water. It contains dolomite lime that breaks down to calcium and magnesium, one less thing for commercial greenhouse growers to add to thier RO water.

OM