Open bottom tank?

[RyanG]

I bet they coated the entire inside of that car with some sort of resin to waterproof it. Some animal rights activist group wouldve been all over that otherwise.

[IceManCometh]

Originally Posted by JBReef

I understand the whole water feeder set up but in a water feeder, when water is called for it is replaced by the air bubbles. in this situation the air is supplied and no water needs to be displaced. unless that air is a closed loop, but how would that work? you would just be recirculating bad air and no oxygen would be introduced to the tank.

the only thing i can think of is that they have a vacuum line with a one-way valve on it, at the top of the tank, sucking out the "bad air" and and a separate line, on the bottom side of the tank...also with a one-way valve on it putting fresh air back into the tank. i could be completely off course, but it seems like it should work. the only problem would be making the suction at the top of the tank correspond to how much air is above the waterline, or else either the vacuum would start sucking water or there would be a water build-up and the surrounding tank (open part) would back up and flood.

maybe someone should send this one into mythbusters and see what they come up with lol