How is this done?

[lastlight]

There is a pocket of air I think already in the top tank.

it's just pushed down and returns to the top.

[StirCrazy]

there can't be any air goi ng into that or it will reduce the vaccume which is required to hole the water colume up in the tank. Personaly I think it is done with Mirors other wise he would need to plumb a vaccume pump into the top of the tall tank to remove air and maintain the vaccume.

Steve

[ron101]

Originally Posted by StirCrazy

there can't be any air goi ng into that or it will reduce the vaccume which is required to hole the water colume up in the tank. Personaly I think it is done with Mirors other wise he would need to plumb a vaccume pump into the top of the tall tank to remove air and maintain the vaccume.

Steve

Has to be this.

And too risky for me. A pump/power/check valve failure means a lot of mopping...

[The Codfather]

On utube there is DIY that shows you how to biuld this tank.

[Floop70]

As cool as that looks I'd think it's a rather large flood waiting to happen.

[lastlight]

if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

[Trigger Man]

It is cool looking, but with any failure in the system I would not want to be the one cleaning up the mess.

[ron101]

Originally Posted by lastlight

if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

Yes but I would be concerned about eventual oxygen depletion from recycling the air. Although there may be enough gas exchange from the 'open' areas of the tank.

[Rippin]

Originally Posted by lastlight

if you placed a mostly full pop bottle of water into the sink upsidedown quickly, the water would stay in the bottle. Could you not then have an air pump with the input inside the bottle drawing from that air cavity at the top? Blow this air into the bottom of the bottle so it just goes right back where it came from?

I think that's exactly what's being done for this aqaurium.

[Delphinus]

Interesting ... I bet that's it. I was thinking it was maybe a panel of glass separating the air curtain from the vacuum side but I bet you're onto something there. A "closed loop" but for air instead of water.