I'm not positive about the fluval, but most canister filters should work
fine once you've got all the air out of the line. Even with the "S", you're
just running a siphon, so as long as the "out" end of the feed tube (from
the tank to the filter) is lower than the surface of the water, you should
be OK.

You might be introducing back pressure problems though - make sure the
fluval can operate with only a 1/2" outflow or you might end up cooking
impellers from too mauch back pressure (has the same effect as running the
filter when its badly clogged)...

--JD

"Harry Muscle" wrote in message
...
I'm gonna be running some custom pipe work in my 55G to provide
undergravel
jets. This means I have to make a transition between the pipes supplied
with my Fluval 404 and my 1/2 PVC pipes. I would prefer to make this
transition inside the stand, not the fish tank (long story why). So
here's
my question. The way the pipes would be arranged is that the pipe would
form a S on it's side (meaning it would leave the filter at a certain
height, then bend to go a couple inches lower, take the transition, and
then
head up to the tank). I'm wondering if such a scenario would work, since
now I have spots where air or water might get trapped. Are canister
filters
designed to work properly only if the pipes go straight up to the tank.

I hope my explanation makes sense ... but if not, here's a bad picture of
what I mean:

----- TANK
|
| P
| I
-------- | P
| | | E
----- | |
| | | |
| | -----
-----
FILTER

Thank you for any feedback,
Harry

P.S. I'm wondering if the filter itself will work, as well as, if the
priming feature will work, since I've heard it's supposed to work OK if
the
output pipe is located above water level (which it is). Thanks again.




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