In the Lopez-Anthony household, potty training doesn't come easy -- or cheap!

During a Tuesday appearance on The Tonight Show With Jay Leno, Marc Anthony, 41, revealed that son Max, 3, recently used their swimming pool as his own personal bathroom.

"He had an accident in the pool. It got into the filtration system and they charged us to clean it. That was expensive," Anthony recalled. "He took a $6,000 dump in the pool!"

The singer added that he and Jennifer Lopez, his wife of seven years, believed that potty training was "in full force," but Max and his twin sister Emme "figured out" a way to outsmart their parents.

"In order to potty train them, every time they'd use the toilet we'd give them a lollipop. Three days passed and we ran out of lollipops," Anthony said. "I'm like, 'You should probably get them checked out if they're using the potty that much.'"