Bests & Worsts Reviews from Amazon

We have two cats in our 4,000 sq ft house. When my sister came from out of state, she asked if our cats ran away. She said our home had zero odor or scents, which is what I was going for. I have two of these units and one of the next size up. The larger one sits in the doorway of the cats' restroom, one in the master suite, and one in the kitchen. On the lowest setting, dust from the litter box is immediately whisked away and cooking odors do not linger. I prefer the manual operation to the larger unit's electronic controls. We have power outages frequently and the manual units power up as soon as electrical service is restored, but the electronic unit must be turned back on by a human. We live in a more rural area, near large farms and constant construction; with an indoor litter box, the dust accumulation on indoor surfaces became overwhelming, even with my Roomba 650 running five days a week. (My robot picks up cat litter and hair like magic, but isn't much use with fine dust). I've cleaned the filters on all three one time in the almost 90 days since we've had them. I knock the dust out of the pre-carbon filter and blow the HEPA filter out with an air compressor. I used to dust nearly every day, now I dust and deep clean about once a month. I've also noticed I haven't had to treat our long haired cat, who also spends a lot of time outside, for ear mites since February. I did replace the thin pre-carbon filters with a Filtrete brand that you cut to size when I cleaned the units a few weeks ago. I'm attaching photos of the filter I removed and cleaned from the unit closest to the litter box, the before cleaning photo reflects how much dust was collected in a little over two weeks. (I attached a photo of the same filter after knocking the dust out). The other photo is of the furry bastard who throws cat litter and hair all over my house. He's shedding, but I've foiled his plans to make my life a living hell. Thanks to the Roomba and these Germguardian air purifiers, he'll have to be satisfied with annoying the crap out of me in other ways.