A combination of a steel rake and crystal cat litter lets the PetSafe ScoopFree to outperform other raking boxes. While other self-cleaning packing containers with rakes tended to jam up and pass up clumps, the PetSafe ScoopFree worked consistently, scraping up solids and carrying them right into a waste compartment. https://lorenzovlare.theideasblog.com/37036971/the-smart-trick-of-automatic-litter-box-that-nobody-is-discussing