I think the 4 inch Terra bloom carbon filter is off my purchasing list. I look back at my purchases and saw that 1 year is all I can get out of a filter. The Airflow was quite down at the end of the last grow comment but I thought it was because of the prefilter. And that prefilter is pretty much crap too. Very crappy construction
So a replacement is $54 on Amazon. The same size AC Infinity is $69. I know the AC Infinity Pre Filter is much better construction with the purchase of the 6 inch one I did earlier this past month.
So when my 2x4 goes in to flower, I'll go ahead and purchase the AC infinity filter................canna budget is currently blown.
I had problems keeping my temperature down in that tent. I pulled the filter off that thing and it flowed like crazy!
I think when these fans in the small tents go out, I'm going to replace them with AC Infinity. Probably not the smart ones. I just don't think they're needed in a small hints with the way I maintain the environment in the lung room.