The start of a new Kratky setup for my Tiny Tim tomatoes. Will have individual pot locations and a fill and drain location so I don't have to interrupt the plants to do nutrient changes and top offs.
My thought is, I have 2 plants in a 5 gallon tote that usually has 2-3 gallons any given time and they are doing great with the airstone. So, I have a 4" conduit system designed to hold 11 plants, each spaced about 18" apart so, 4"x3.14x18" is 226ci per 18" run of conduit.
A gallon of water is 231ci so, each plant will have roughly 1 gallon of water for itself. Which is roughly what it has in the tote. But this way I don't have to raise any lids or worry about dostrubing the plants when they are tied off to keep them upright.
I'll have a vertical T in the end of my system that will have a threaded top to open and add nutes and a ball valve at the bottom of that T to drain nutes for changes. Each of the T's will point up with a 4"-2" reducer and I'll have them about 6" up and the net cups will drop right in for each plant. Time for assembly.