J
JackTheGrower
Wooderson
If he doesn't then you should.
CC
I agree with you CC.. The roots use oxygen. Other microbes will too down low.
One possible way to go is a floor in the tub. With the box I made there is a floor which the earth rests on and several inches of perlite then the drain tube space.
If one made a floor in a tub and had drain holes on one end of the tub with a tube towards the other end that went down to the air space below the floor that would be good I am thinking..
Some folks write that their plants are not doing well in the tubs and all of then have poor drainage and poor air I find.
If anyone would like to see how a big box was constructed let me know.
It would give some ideas.
Ernst