What do I do if I see urine pooling at the bottom waste bin?
Urine will never leak into the drawer (pull-out waste bin) unless there is not enough litter to absorb the urine. You must first make sure that you are using a quality clumping litter as well as the appropriate amount of litter indicated by the maximum fill line.
Also, please ensure to sift daily and try not to perform the sifting action right after the cat has urinated. The litter may not have had enough time to clump properly.