OK, I post now more pictures showing how my DripGrow towers are doing. Note that during the testing for about two months, I had used several ways to construct the towers, but the water feeding system is the same, using low power airlift pumps.
This first pic shows two systems using five towers: one system is an aquaponic system (blue is the fish tank) with four towers - one tower is blocked in this first pic so I will post several pics, and one is a hydroponic system with the bamboo tower and two rectangular plastic containers:
Note that the two towers built with double wyes were the hardest to get water onto the grow zones. I had to use sponges and rockwool to stuff the inside right above the grow zones, and for the four grow zones on the top I used four tubes to directly
feed water there. The two downspout towers and one bamboo tower, however, are doing well in getting the dripping water, whether using net cups or rockwool cubes directly. As I said earlier, as long as the water is dripping onto one another, everything is wet and fine.
Note that I am NOT using the two newest towers in the first post because I do not have
enough air outlets right now as I am switching to test the use of DripGrow in growing microgreens (will post as a separate topic).
As you can see in the following pic, I am using one air outlet split into two to feed air (using airstones) into two fish tanks I have (one fish tank is part of the Aqualibrium kit someone gave me), one outlet for the hydroponic airlift pump, two outlets for the aquaponic system (one to move water from fish tank to hydroton filter
bucket and one to lift water all the way to the top and then split into four to feed water for the four towers with the system).