Decent progress today. Geyser pump works, although it is not particularly efficient at pumping water, the fact is, it DOES do the job. Waiting for the silicone to dry on various parts so that the fully automated nutrient mixing and PH balancing system can be assembled. And finally, I now have two 1 gallon containers, one with a solenoid valve that allows the nutrients to be dispensed, and the other as a collection container that has a functioning geyser pump that will return the nutrients back to the nutrient container. Next up, I need to set up some sort of level checking system so I know when to turn off the geyser pump, and I may look into modulating the air pump to see if that makes any difference.