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Re: NFC: Another Filter/Aquarium Question

I'm a little confused....
If you have a 170 G tank, and you put any size pipe on it at all, but put
that pipe up at the top surface of the tank, the water level can only drop
to the lowest level of the pipe.  A few well-planned holes can even stop
it before then.  For instance, on my sump system, when the power goes out,
the water backflows into the sump.  However, the return for the system is
a sort of Z shape, and at the top of the Z, where the horizontal edge ends
and verticle begins, I've drilled a 1/8" hole.  The water drops to here,
sucks in air, and breaks the siphon.  

Now, if you use a drilled overflow to put water into the sump (i.e., the
"input") you can possibly overflow the sump.  The water will drain to the
bottom of the drain, and there's nothing you can do to stop it.  SImply
figuring out how many gallons that would be (Measure the volume of that
slice in inches, and divide by 231) and appropriating enough space in the
sump works well.  I've seen many bizzare systems involving arrays of 10G
tanks (much like what I have, actually!~) that accomplish this quite


Joshua L. Wiegert
NFC Lists Administrator                          JLW at pi_dune.net
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ICQ 69551951                                     AIM UID: Etheosoma
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On Sat, 13 Jan 2001, Larry Needham wrote:

> Date: Sat, 13 Jan 2001 01:48:19 -0600
> From: Larry Needham <LBN at satx_rr.com>
> Reply-To: nfc at actwin_com
> To: nfc at actwin_com
> Subject: Re: NFC: Another Filter/Aquarium Question
> Well...right...uh...I'm going to drill a hole in my tank.  I want it to be
> as high up as possible.  The reason I related this concern to the elbow
> diameter is so I wouldn't put the hole too high.  If I'm pumping 500
> gallons/hr into a 170 gallon tank, a 1 inch elbow will allow 500 gallons/hr
> to fall back into the wet / dry filter.  However, the water does not fall
> instantaneously...because of the viscosity of water the water level in the
> tank will probably be 1/4 inch... 1/2 inch... maybe more above the top of
> the elbow opening.  I guess what I'm trying to find out is how high does the
> water level stay above a 1" inch opening when pumping typical amounts of
> water back into the tank.  If I put the opening of the elbow flush with the
> top of the tank I will have overflow.  If I put it 1/2 inch below the top of
> the tank...I might still have over flow.  I want a good 1/2" - 3/4" to spare
> at the top of the tank above the max water height.  Say I want 3/4 inch, and
> the water level stays 1/4" above the opening of the elbow...then I need to
> put the opening of the elbow 1" below the top of the tank.
> That's an incredibly terrible way to simply ask how much higher is the water
> level in a typical wet / dry setup with a 1" return line when the pump is
> running as opposed to when it is not?
> I just want to make sure 1 inch tubing is adequate, and to drill my hole in
> the right spot...the first time.  I'll of course have some leeway by being
> able to trim the elbow back or put an extension inside it...but I want it to
> look as professionally done as possible.
> Thanks for the input...Joshua too!
> Larry
> > If you put it midlevel you stand a chance of coming
> > home someday and finding half the water from the tank
> > on the floor, failures happen. Put the elbow at the
> > level you want the water to be. If you want to play it
> > safe you could go a half inch over what your pump
> > outlet is.

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