Absorb. Toss. Replace. No ammonia odor guaranteed for 7 days. Each pad lasts up to 1 week for 1 cat. How Breeze works. Pellets allow liquids to pass through to be locked away in the pad below. Fast-absorbing pads lock away liquids & ammonia odor for up to 1 week for 1 cat. No urine clumps to scoop. Drawer pulls out for fast, no-touch pad changes. Refills compatible with all Breeze systems. Litter systems & refill pellets also sold separately