I have made 8 units all 24 x 16 x 8-3/4 rubber made toot containers.
2 of them have 2 pots each of 8 dia for a total of 4 8 pots 2 types tomatoes.
2 of them have 2 pots each of 6 dia for a total of 4 6 pots 2 brussel sprouts and 2 eggplants.
The above will all be on a 5 gallon pail with higher nitrogen and ph.
The next collection is 4 toots. 2 with 6 4 pots for 12 types of herbs
and 2 with 3 - 6 pots for cayenne peppers.
The same all 4 on a 5 gallon pail but lower
nutrient and ph.
The whole system is bassed on pex pipe or HDPE the white flexible pipe for water distribution in most homes theses days. I find the plastic pex barbed fittings work well I do not put a crimp ring on any of the pipe that is submerged in solution, instead I use the orange Teflon tape and wrap the fitting a few times to form a gasket. It is handy to use on pumps with a Ύ fip x ½ barbed fitting because the Ύ pex is 1/2 on the inside and fits the
pump like a glove. The pvc that is used for venting furnaces and water heaters is much thicker Ό and in my books that makes it subject to a tap and die set. Threading this pipe is very easy and will make a professional looking job
oh and I will be adding 2 - 300 watt photo electric panels to an inverter with 2 deep cycle batteries to avoid the use of extension cords.
I cant wait to plant this out side.
Hope you do not mind a little ramble