Other things may work, but those special pellets seem designed to smell like " a place I should pee' ...?
Once they find it, they seem to use it. If they ever plan on using it. Pook however thinks its a sandbath, and just digs in his, his potty spot is elsewhere, so I just remove and replace bedding there since he's so attached to the spot. He will on occasion fall in love with a spot on the second floor platform. No discernible order or reason, except that we can see him back up to the glass, lift his tail, and wee in our general direction.....
