Join Date: Apr 2008
Location: Mobile, AL
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For charcoal pre-filter, I use this in on my home furnace/air handler intake, on top of the normal filter. They do wonders to attract and capture cat hair and even some larger dust. I have 4 cats and the charcoal definitely helps reduce litterbox aroma. Plus, I can use a high end 20 dollar 3M furnace filter and only change it every 3 months, changing the pre-filter only every couple of weeks (5 bucks a month to save 40 bucks a month).
I'm not sure if this can be velcro-strapped to the air filter mentioned earlier, but it's worth a shot. I can imagine getting about 20 Smart size prefilters out of this, and the rest can go to your home air intake.
Even 16 bucks for an air filter is too much, IMHO. But if it's once a year... maybe not so bad.