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The other thing I was thinking is this... the collars are half way up the tube. The net pots bases are I guess about half way down the tube. This is critical initially to stop any dry zones between the plant and the root entrails. I guess he gets air in the zone within the net pot and when root...

Absolutely it is! But if memory serves me well the optimal temp for plant health and max dissolved oxygen is 21 degrees. Also dissolved oxygen at this temp within water is only 2% of that which roots would be getting from the air in even a soil medium so I fail to understand how this guy is...

Will do man. Gonna be a while though cos my current build is cycling I don't have anymore space or time at the mo. If it aint broke don't fix it kinda thing. But I'm looking for another space cos I want to build this badly. Probably a few months away!

Thanks for that feedback. That actually galvanises my theory that the plants would in fact do better if the set up could drain. Based on that I may test how long it takes to fill to colar height and set pumps to run for this period only allowing drainage at the instant the levels get to maximum...

Oh also I am gonna use x2 600 hps attached to a light mover on rollers so as 1 light lowers the other raises and so on and so forth!

The most inspiring set up ever!! I'm stealing the idea and modifying it. Building a 6 tear setup, slightly wider and doubling it as a figure 8 still using only 1 res, possibly sunk into the ground. I am also gonna drill holes in the in each adjustable collar. I want to be able to slowly fill...