Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I think it is a very important step to see if your finished water is acceptable.
Push for a large tank (minimum 50 gallons or so, I would think, but I could see a really nice 125 gallon, 6' long tank) and use small native fish and plants that are fairly local to the location you release the water. Make it as accurate as possible.
Use the flow though water change system so that there is a constant influx of new water, perhaps a gallon or so per hour (depends on tank size- 1-2% of the tank volume per hour) and a constant drain. A drilled tank is much the best way to set this up.