Furba litter box

Contains 2 litter boxes + 1 sieve + 1 clip-on frame
Sieve particularly suitable for clumping litter
Operation is very simple:

Lift the sieve.
Throw the droppings
Separate the upper tray (now filled with litter) and the lower tray (empty)
Place the sieve in the empty container
Pour the remaining litter into the empty tray, over the sieve