So are you scrubbing outside air?I use this but no longer recirculate as I was able to run a line outside. I get about 2-3 weeks but my outside air is crap; it comes from nearby NYC on prevailing southwest air flow.
Several folk around here use this, but I have not compared it to BRS.
https://www.shopmedvet.com/product/soda-lime-5-gallon-JOR553B
$116 plus $5 shipping. Used to be $99 not that long ago.
