"Pete" wrote in message
...
For sealing you can also look for a glue called Goop. Comes in different
varieties but Household Goop is the one I use. Good thing about it is
it's
one of the few glues that sticks to the plastic these bottles are made of,
it also stays flexible so acts as a sealant. I just drill a hole in the
cap of the juice container (nice big cap which is another advantage), put
the tube in, use the goop to glue/seal, push a little more tube into the
top which pushes the glue into the hole and it's sealed. With the big cap
I actually have two bottles in series. One bottles line goes into the
other
bottle (so two holes in that lid) which goes to the canister filter.

Here's a trick for anyone inj into a canister filter. If you are feeding
your CO2 to an intake that's low or near the bottom of your tank, then you
do need lots of pressure and a perfect seal to get the CO2 down that far.
But, if you drill a hole just under the water line in the intake tube
(this
is the tube that fits IN your tank and is under water, not the tube that's
outside your tank going down to your filter) to the canister filter and
put
your CO2 hose there (a good fit is needed but not airtight), the water
flow
will actually create a suction on the hose so you don't need a heavy seal
on your CO2 bottles to make lots of pressure. A good way to remove the
worry of whether your air hose is CO2 permeable and such.

A good tip, but as a safe guard I would be placing check valves on the
bottle lines to stop the intake siphoning the bottle contents if a low
pressure situation should arise. OR. use an external bubble counter made of
a 1.25L bottle 50% filled with water to buffer the gas.

When I place my line on a venturi I do this because I don't want the filter
sucking yeast mixture into the tank.

Oz

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My Aquatic web Blog is at http://members.optusnet.com.au/ivan.smith