That's a great idea! I won't be able to use gravity in this case though since it will just be sitting on my desk at work. Either way there are risks involved too. I would also probably limit it to like one gallon so that way when your flat valve inevitably fails you only have one gallon of water on the floor. Mine also had a built in alarm if it gets overflowed.I understand the need for ATO; it helps prevent fluctuation in SG. What I don't understand is the elaborate ATO systems. I keep a 5 gallon water cooler jug with top off water off to the side at a level higher than the sump. Then I just us a good, old - fashioned siphon to a float valve in the sump. 24 bucks.
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