The problem I am facing is that the coolers only come in 75 qt. (18.75 gal), 100 qt. (25 gal), and 150 qt. (37.5 gal)..
There is at least one aero grow using 1 gl per plant.
He reports it is working OK,
but I haven't "seen" the end result.
Maybe he will "pop in" here
and let us know how it's going.
The size of your plants,
and your grow room VPD,
will affect the optimum rez volume.
Please note, it is my intention to connect my rez to an RO water supply tank using a float valve. However, I don't wish to consistently spike the PH and ppm of my rez. Therefore, I want to make sure my rez is, as you said, large enough to maintain consistent levels of whatever and small enough to fit in my growing area
The float valve feeding from my RO rez,
is what really makes the system work.
I think you will find
that your rez
will be very stable,
if you are feeding it with RO.
I can teach you how to buffer your solution for long term pH stability,
of course you can't get lazy, you still need regular flushing.
My tubs are large, 56gl,
but my 6 inch pipes go into the sides,
so this limits the amount each tub holds,
to 15gl per side.
I like growing tall plants.
The top of the Space Shuttle's
6 inch pipes
are just
20 inches off of the floor,
giving it
74 inches vertical grow space,
allowing me to gorw a 60 inch plant last time..
(next time 70")
As a result, my rez volume is limited to 30gls,
but I don't want to grow more than 4 plants at once.
I am modifying the space shuttle,
placing the main spray pump outside of the rez,
instead of being submerged.
This will allow me to lower my gl/ plant
to fit whatever I have growing at the time.
Before, she required a
minimum of 18 gl
just to submerge the
big spray pump.
Now I will have the option of adjusting my gl/plant
to meet the "phase of growth" requirements during veg,
when the plants are small,
and bloom, when they have grown to 6 footers.
The Shuttle is in for some upgrades.
And I spent $50 on new fittings for my RO rez.
Those 1/2" bulkhead fittings are $19 ea.
Be sure and send me a link
when you get your aero set up.
.