Okay, finally. So, the hydro tank has been designed and built, and actually turned out pretty good:
View attachment 4075759
The double walls are composed of 1/2" plywood on the inside lined with plastic shower stall material from Home Depot, and 1/4" veneer on the outside. Between is 1/2" of Styrofoam insulation. Inside corners are rounded off with 45' inserts to ease cleaning.
I have a commercial air pump -- damn those things are noisy and hot -- and a 4" airstone below each airpot. The 5-inch net pots give some idea of the scale, but with the water level at 1.5" below the bottom of the pots gives me 26 gallons. A lot of water, I know, but it should give me more stability in pH and fewer solution changes.
I also installed 1/2" sprinkler pipe inside the tank attached to a 390 GPH submersible water pump with 1/4" lines that go to each pot with a small sprinkler head on the end. The pump runs 1 minute on, 9 minutes off.
I'd like to follow
@OldMedUser's schedule and change the tank only 2-3 times during a grow cycle, but I want to use tap water and ours carries ~60 PPM of dissolved "stuff." Will that be a problem as I top off the res with the same tap water, adding more "stuff" every time?
So I'm ready for some plants. How developed should the roots be on clones before putting them into the hydro pots?