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How Is It Done?

helterskelter said:
jacblades said:
i see how it could work without the constant airflow, but WITH it?
how?!?

http://www.youtube.com/user/Fishfreedom
Click to expand...


Having massive sump filter's so it may look like a lot fish in a small tank, but their is a massive amount of water so the biomass in total is quite low.
Click to expand...

i'm not talking about the bioload. you have to watch further into the videos to see how the tank is set up and what i'm talking about.
it's some magical pressure thing.

edit:the main video in the link doesn't show the whole tank. watch any of the other videos to see how he has his tanks set up. i don't understand the science of it.
 
Oh i see it's a basicaly a tower, and if u had aeration this would not work.

Looks good though, bet it's hard to get all the air out of in the first place to set it up.
 
but there IS air in there. he has airstones in them. i know how a vacuum works..without air.
that's the point of my post. i am asking how this is possible WITH a continuous airflow, as shown in these videos.
 
Didn't see that :blush: well, I'm stumped...
Although I am pretty sure I learned it last year in chemistry... I know that if the air pressure is equal inside and outside the water would stay, but I don't know how that would work in that tank...
 
Arrr Ok, that first video in not a tower like the other's, it's just a big tank with a massive sump and need's the aeration to keep all them all happy in the small area.

The other's are towers using a vacuum to keep the water in.
 
I'd be more concerned what happens when whatever holds up that water suddenly doesn't any more ... anyone got a wet & dry vacuum :blink:
 
OK, here is my guess......
The tank uses an old fassioned piston pump. This type of pump can pump air at great pressure to depths of over 10metres, so the pressure is not a factor. The particular modle used would have to have two identical sized cylinders driven by the same fly wheel. One piston would be attached to a tube leading to the top of the tank, with the pistons output releasing the air into the atmosphere. This creates a vacume, drawing up the water from the large tank, which is refilled as required to compensate. Then, when the water gets close to the top, the second cyliders output is connected to the airstone. Due to the nature of this type of pump, the amound of air beeing pumped into the tank is equil to that beeing pumped out. Also, the air being pumped in would be fresh, rather than re-cycled. Just use non-return valves, in case of power failure e.c.t, so the water stays in the top tank should something happen to the pump. These pumps can handle unbelivable pressure, and run reliably for years. Assuming the top tank is sealed, I see no reason as to why my theory woulden't work, unless I overlooked something??
Rabbut
 
I think its all "kidology" theres a few pics of the same setup - all with different fish, I suspect the top IS sealed, and the whole shebang is only setup during the photos... for a few minutes.
 
I made my suggestion in this thread but I couldn't think of a readily available pump that would do the job.
 
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