The niece of my friend was not that lucky (4 years ago). After playing in 波波池, she got very sick (about 2 years' old ). Doctor could not find any causes at the beginning. After about months tests & the girl stayed in ICU for nearly a year. Many internal organ got damaged by A LOT OF different unknown virus / bacteria. Finally, she was recovered but with very weak health. The doctor (瑪麗醫院) said it was the dirty 波波池 caused the illness. Children should not go there.