Having now used this system for the third year in a row, I strongly recommend housing the float valve in its own, clear container. That way, if anything ever goes wrong and the water level drops, you'll be able to see it immediately, and access the float valve for adjustment. I've had a few occasions where the valve just needed to be wiggled a bit to clear an obstruction. If it's the bottom of an EarthTainer, I don't know how you would ever access it.
Adding the "control reservoir" with the float valve amounts to a $1 plastic container from Target, and an extra $0.50 grommet.
Good luck!
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