The PeeWee litter system is designed with sustainability and hygiene in mind. The wood pellets are 100% biodegradable and highly absorbant. The two-layer system means litter lasts much longer and odours are reduced. The PeeWee EcoMinor litter tray is made up of two parts, a lower container and an upper grid layer. When the cat urinates, 90% of the urine falls through the grid of the upper box into the lower container. The rest of the urine is absorbed by the pellets in the upper part, which then turns into sawdust. When the cat digs, the sawdust falls through the holes in the grid, allowing the grains in the upper box to remain clean. It also keeps the cat's paws clean and dry, so that the cat will no longer leave paw prints outside the litter tray.
This video demonstrates how the PeeWee litter tray system works (the product featured is the closed EcoHouse litter tray but the system is exactly the same with EcoMinor).