The Crystal Litter Set is specifically designed for the Purobot Crystal Duo self-cleaning litter box. Allows you to forget about scooping or cleaning for up to 30 days! It absorbs urine and dry solid waste quickly, effectively minimizing odors. Leave the automatic litter box for weeks without scooping, refilling, or cleaning. With a fragrance-free formula, it's safe for both sensitive cats and their owners. Low-tracking crystal cat litter is 99% dust-free. Disposable and leak-proof tray makes cleaning a breeze.