With three cats, it’s important to have good litter. I’ve tried crystals, clay, scented and unscented. I’ve settle on Boxiecat ($(removed) for a 16 lb bag). It’s unscented but absorbs odors, clumps well, and there’s very little dust. Best of all, the stuff seems to last forever. I just pour in a little from the bag every few days. There’s no need to completely clean the litterbox every couple of weeks. Instead, I do a full dump-and-scrub every couple of months.
Two other essential litterbox items: the Clevercat litter box and the heavyweight Durascoop cat litter scoop.