Weighing options for filter inlet/outlet - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 01-23-2019, 01:26 PM Thread Starter
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Weighing options for filter inlet/outlet

I posted a similar thread in the equipment forum but didn't get much action, so hope it's ok to post again here.

I'm planning a 20 G tank with a water level about half the height of the tank, so about 7 inches below the tank rim.

I'd love to use glass lily pipes with an Eheim canister, but they don't seem to make outflow pipes that reach low enough for my situation. But I can find inflow pipes that reach below 7 inches.

My question is: Would there be any issues with using an inflow pipe as an outflow pipe?

I'm thinking of buying two of these. One for inflow, one for outflow.



TIA!


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post #2 of 3 (permalink) Old 01-24-2019, 07:18 PM
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Hi Blackpearl

I suppose generally, there'd be no problems since water will come back in all the same and "jet" out of the slits in a turbulent manner. What I foresee that might be an issue is if you're trying to control flow. There's a reason why lily pipes are shaped the way they are. That is to create a gentle surface ripple while yet promoting a cyclic flow around the tank. This idea may sound trivial until you realize the logic behind the "insanity." It is a critical part of effective co2 injection. See: 2HR Aquarist's Gas Exchange

If you're going with a half tank, may I ask why the attachment to lily pipes? Is it the transparency? I'm sure there's probably other in/outflows that might fit your needs better. Could probably even make your own out of clear PVC?


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post #3 of 3 (permalink) Old 01-25-2019, 01:08 AM Thread Starter
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Quote:
Originally Posted by ipkiss View Post
Hi Blackpearl

I suppose generally, there'd be no problems since water will come back in all the same and "jet" out of the slits in a turbulent manner. What I foresee that might be an issue is if you're trying to control flow. There's a reason why lily pipes are shaped the way they are. That is to create a gentle surface ripple while yet promoting a cyclic flow around the tank. This idea may sound trivial until you realize the logic behind the "insanity." It is a critical part of effective co2 injection. See: 2HR Aquarist's Gas Exchange

If you're going with a half tank, may I ask why the attachment to lily pipes? Is it the transparency? I'm sure there's probably other in/outflows that might fit your needs better. Could probably even make your own out of clear PVC?
Thanks for the reply! Yeah, one of my concerns was circulation and surface agitation wouldn't be as good.

I did mostly want glass lily pipes for the look. I actually won't be using CO2 so perhaps I could be more flexible with equipment choice.

The tank will have an emergent area in one back corner leaving an L-shaped area of open water, so I don't think a spray bar would work. I was picturing an outflow pipe at one end of the L and the inflow at the other, but I'm not experienced enough to know if that would be the best configuration.

I started looking into diy pipes made with acrylic tubing and it seems doable! I might try it out if I can find a heat gun to borrow.


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