Just to be safe I bought activated carbon charcoal and will be reloading my filter. I bought the flake stuff instead of the pellets because it seems to be better for air filters, more surface area. I haven't done the deed yet, but intend to use a rubber mallet to tap the filter to settle the charcoal after packing it in. I'll try to post a few pics of the process and results. The filter is about 20 pounds, 2 feet long, 6" flange, purchased online for less than $100 way less than a year ago, but it is definitely losing its ability to remove odor. The Ona gel is great, I have it in the meantime in the area of the filter exhaust and today took it completely out of the container to maximize its effectiveness. Stealth makes sense with my situation, but for the life of me I can't understand why it is anyone's business what I grow and smoke. Today I hung my state issued card and increased plant count paperwork in the grow room just in case there is a visit.