I spent over 3 bills on my current filter and fan combo, I think I probably over bought , better too big than too small. I just had a guy come over , he'd been here for awhile and left to run up to the 7-11 , he said he smells my shit all the way down the street , I'm 10 feet from it and don't smell a thing :/
I decided not to run my filter this time. You can also figure you'll be buying a new filter every year or so depending on the humidity and other things. year to a year and a half and the carbon will plug. they don't last forever.