A 32-year-old Philadelphia woman has invented the CitiKitty cat toilet training kit and has already made $700,000 in sales. She's projected to make $1 million by the end of the year.

The kit sells for $24.98 and transitions a cat from using the litter box to the toilet. The first tray placed in the toilet is solid, but the follow-up trays have holes in them which eventually disappear so the cat is using the toilet without a litter box in it.

The idea came to her when she and her husband were sharing a small apartment in New York and didn't even have room for a litter box.