overflow question

[David Young]

I have an acrylic overflow,weir style, on my 120 gallon tank. I have had
more than one occasion that it has stopped flowing and the tank has come
close to or has overflowed. I initially used the water lift pump that came
with it to remove air from the weir. That burnt up and I now have an air
tube running to a powerhead drawing any air out. I did not have this problem
with my old "U" tube overflow box that is still running religeously on my 65
gallon tank.

Would the likely buildup of air in the weir be too much water flow churning
air through the weir, or not enough water flow to pull the air through. With
my "U" tube the air bubbles just go on through. With the weir they seem to
accumulate in the top of the chamber. It seems that I should be able to use
this without having to constantly pump air out of it.

Thanks,
Dave Young

[Marc Levenson]

Yes, you need more flow to wash them through. I did what you are doing,
sucking air with tubing from the top of my weir via the intake of a
powerhead in the tank, and that worked great for me.

Marc


David Young wrote:
> I have an acrylic overflow,weir style, on my 120 gallon tank. I have had
> more than one occasion that it has stopped flowing and the tank has come
> close to or has overflowed. I initially used the water lift pump that came
> with it to remove air from the weir. That burnt up and I now have an air
> tube running to a powerhead drawing any air out. I did not have this problem
> with my old "U" tube overflow box that is still running religeously on my 65
> gallon tank.
>
> Would the likely buildup of air in the weir be too much water flow churning
> air through the weir, or not enough water flow to pull the air through. With
> my "U" tube the air bubbles just go on through. With the weir they seem to
> accumulate in the top of the chamber. It seems that I should be able to use
> this without having to constantly pump air out of it.
>
> Thanks,
> Dave Young
>
>

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[kim gross]

You need more flow to wash out the air bubbles. Now you do need to be
very careful when you use a powerhead to suck out the air. If you pump
quites (as in a power outage) your airline could siphon water out of
your tank down to the level of the powerhead rather than the level of
the weir.

Kim

> I have an acrylic overflow,weir style, on my 120 gallon tank. I have had
> more than one occasion that it has stopped flowing and the tank has come
> close to or has overflowed. I initially used the water lift pump that came
> with it to remove air from the weir. That burnt up and I now have an air
> tube running to a powerhead drawing any air out. I did not have this problem
> with my old "U" tube overflow box that is still running religeously on my 65
> gallon tank.
>
> Would the likely buildup of air in the weir be too much water flow churning
> air through the weir, or not enough water flow to pull the air through. With
> my "U" tube the air bubbles just go on through. With the weir they seem to
> accumulate in the top of the chamber. It seems that I should be able to use
> this without having to constantly pump air out of it.
>
> Thanks,
> Dave Young
>
>

[David Young]

Thanks for the advice!
Dave

"kim gross" > wrote in message
...
> You need more flow to wash out the air bubbles. Now you do need to be
> very careful when you use a powerhead to suck out the air. If you pump
> quites (as in a power outage) your airline could siphon water out of your
> tank down to the level of the powerhead rather than the level of the weir.
>
> Kim
>
>> I have an acrylic overflow,weir style, on my 120 gallon tank. I have had
>> more than one occasion that it has stopped flowing and the tank has come
>> close to or has overflowed. I initially used the water lift pump that
>> came with it to remove air from the weir. That burnt up and I now have an
>> air tube running to a powerhead drawing any air out. I did not have this
>> problem with my old "U" tube overflow box that is still running
>> religeously on my 65 gallon tank.
>>
>> Would the likely buildup of air in the weir be too much water flow
>> churning air through the weir, or not enough water flow to pull the air
>> through. With my "U" tube the air bubbles just go on through. With the
>> weir they seem to accumulate in the top of the chamber. It seems that I
>> should be able to use this without having to constantly pump air out of
>> it.
>>
>> Thanks,
>> Dave Young