I got a Coway air purifier after I have my cats cause their fur is everywhere and their poop still smells even I'm using a covered litter box.
But it doesn't really work with faeces's smell la. Funny thing is it gets very sensitive when I got out from bath ah, use perfume ah or air freshener, everything that smells good will makes it turns red. Then when my cat poops, even very smelly it also remained blue. (The litter box is just next to it)
Fur also don't help much, my cabinet, rack, floor, everywhere still can see their fur.
But when the agent come for service, the filter is coated with fur and dust la, so it still got help abit i guess?