BoxiePro Air Lightweight, Deep Clean, Scent Free, Hard Clumping Cat Litter - Plant-Based Formula - Cleaner Home - Ultra Clean Litter Enjoy less litter mess with BoxiePro Air Lightweight Deep Clean Probiotic Unscented Clumping Cat Litter. This lightweight litter is free from heavy clay and dust, making it easy to pick up and pour. Non-stick clumps work quickly to lock away moisture and help keep your feline’s facilities fresh. Plus, natural probiotics gently eliminate odors without masking them. These probiotics keep cleaning even when your kitty tracks litter outside of his box—preventing unwanted odors from lingering in your home.