I removed the metal cloth, whatever you called it, added some circumference to the filter using a cut up towel, and I was able to add an additional 12 pounds of carbon. Works perfectly, but not while my air conditioner is running. Only reason is, there is a pressure on the room when the ac is on, and I have a shitty squirrel cage fan pulling air through the filter. I've got a 440 cfm can fan on the way, so, troubles will end after that.
ps. there are different types of ona, one is linen fresh, other is some polar one