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post #1 of 8 (permalink) Old 01-10-2011, 07:12 AM Thread Starter
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Paranoid Question

Heya,

Currently I have a Hagen Cylinder/Ladder running in my tank and wanted to make sure there is no chance the tank will siphon back 'up' and into the bottle. I know I can put in a check valve - but I don't have time to do this before I go away for a coupe of days.

The cylinder is placed on top of the tank, in a stable position - there is no way the cylinder will end up below the water level.

My concern is if the mixture runs out, if this has any impact on whether a siphon will start?

Your help is greatly appreciated!

Cheers
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post #2 of 8 (permalink) Old 01-10-2011, 03:14 PM
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If the mixture runs out completely and entirely stops producing gas, some water will eventually siphon back. Actually, it doesn't back-siphon, it's just the CO2 dissolving in water so it looks like the water "moves" back into the tubing.

But even if that happens, and even if it fills the bottle, and even if a little bit of solution starts to diffuse into the tank, I would think that would happen only after a month or more of starting the mixture, and not be a huge issue unless you let it sit there for several months.


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post #3 of 8 (permalink) Old 01-10-2011, 03:20 PM
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I'd pick up a cheap check valve from walmart, petco, or petsmart for short term use. (actually they can use it long term with diy). Why risk it when you can be safe for about 2 bucks.
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post #4 of 8 (permalink) Old 01-10-2011, 04:37 PM
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for the 3 dollars it's worth the peace of mind
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post #5 of 8 (permalink) Old 01-10-2011, 06:05 PM
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if the cylinder is on top there is no chance of syphoning
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post #6 of 8 (permalink) Old 01-10-2011, 07:00 PM Thread Starter
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Cheers guys
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post #7 of 8 (permalink) Old 01-16-2011, 02:21 AM
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I use a separator bottle.
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post #8 of 8 (permalink) Old 01-18-2011, 02:14 AM
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Quote:
Originally Posted by Wasserpest View Post
If the mixture runs out completely and entirely stops producing gas, some water will eventually siphon back. Actually, it doesn't back-siphon, it's just the CO2 dissolving in water so it looks like the water "moves" back into the tubing.

But even if that happens, and even if it fills the bottle, and even if a little bit of solution starts to diffuse into the tank, I would think that would happen only after a month or more of starting the mixture, and not be a huge issue unless you let it sit there for several months.
The danger is that in some designs what can happen is that the influx of relatively clean aquarium water can restart the yeast/sugar reaction. The CO2 can then cause water to be forced out of the bottle (depending on the way the airline penetrates the cap of the bottle) and theoretically inject yeast/sugar/alcohol into the aquarium. The same effect can happen if your yeast/sugar mix is still warm when you hook it up to the aquarium. Once it all cools off the air in the bottle will contract, sucking water down the hose into the reactor which can then pump its contents into the aquarium by producing CO2.
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