It is very similar to the toilet you use. For this type of litter, you need unique, recyclable sand that can be washed and reused. It must be connected to a water source in the shape of a toilet bowl, from where the tank is fed to a pipe where it will remove the cleaned residues. After it has been used, the litter box begins a cleaning program involving liquefying the feces and disposing of them in the large toilet or bathroom drain where it was connected. This breeder's choice for cat litter has a higher purchase cost once installed; you don't have to worry about cleaning it.