This product is excellent ! It kicks on anytime our pets walk past , anytime I clean . Since getting this unit our air smells fresh and clean and there is a small improvement in dust collecting . We also dust nightly so take that into consideration . We have a little box and we smell it no more . We do clean it everytime the cat goes because I like things neat and clean but when he does a number 2 the smell still lingered some but not anymore ! I love this product !! I also love how it shows when air quality is bad and turns red and turn blue when it’s clean !!