I have been running DIY CO2 for a little over a month now. I started with the Hagen ladder and all seemed well. At one point I wasn't seeing bubbles and upon closer inspection I found that at the bottom where the CO2 bubbles came out there was a build up of while..slime (not sure how exactly to describe it). Cleaned it up and after a while it was there again. I recently ran the line directly into my AC Filter intake. the other night I noticed there was more of this white...stuff building up on the end of the elbow in the intake. Not sure how to describe it exactly ( and no cam for pictures) think fleshy/pulpy/fibrous ..Any clue? Is this a common thing with CO2? Lines are all clear ( and probably way too long) so I can't see it being any backup from CO2 generator