07-28-2007, 09:53 AM
Join Date: Apr 2005
Location: Brentwood, CA, USA
iTrader Positive Rating: 100%
| | Re: questions about canister filter
Priming of a Rena Filstar filter requires that the filter be far enough below the tank to have the head necessary to drive water down thru the filter. I think that is the reason for the 24" number. I see no reason why it wouldn't work with the outlet out of the water, once it it primed, but I'm not as sure it will prime with the outlet out of the water. And, I wouldn't run the CO2 thru the filter - I would use an external reactor, which is absurdly simple to make, instead. But, if the outlet is out of the water, the CO2 would mostly be degassed by the splashing water in the tank.