Join Date: Sep 2004
Location: Long Island, NY
I have heard about gas lock being a problem with this set up, where the CO2 fills up the impeller chamber of the filter, thus causing it operate without any water which can cause damage. This hasn't happened to me after about two years of running it this way.
When I clean the filter, I do see a small "ring" of crust on the bottom of the pump housing; evidence of a gas bubble. But this doesn't appear to block the water flow. Every few days, it belches a few small bubbles.
Bacteria damage would be evident by measurable levels of ammonia or nitrite. I read 0 for both of these. If the bacteria in the filter is being killed, there is apparently enough in the tank to compensate for this.
Eheim pimp Club Member #65