Thanks Hermie. Some good points there. Right now, I have 18 plants, grown from bag seed. I expect about half of them will turn out to be males, so am trying to get enough started to account for that.

And I've come to see my terminology is flawed. I'm not using the filter as a scrubber, but as a vent filter.

After sleeping on it, I went looking at Can Filters today. And I believe I see the issue here. I don't believe I have a leak in the system. I now am of a mind that the HTG no-name is just not enough for my application. Comparing the HTG to a Can Filter 66 - 9.5 inches diameter, 18 inches long, 17 lbs, vs the Can 66 at 12 inches diameter, 26 inches long, 44 lbs. I'd guess about double the carbon in there, if not more. Not a slam at HTG's filter. Just seems I need more horsepower, so to speak, to do the job.

HTG is closed on Mondays - going to speak to them tomorrow about trading up. Have a feeling they won't go for it, but will see what they say. I have to do something, no question. The whole basement stinks now, and it is noticeable when you walk into the house.

Should have gone with a Can Fan/Can Filter 66 combo from the beginning, I suppose, in hindsight. Live and learn, but often the learning experience is a pain in the wallet.

Will post an update, in the hopes it will help other newbs out there.

Thanks all for replying. Appreciate it very much.