There is also a swimming pool in the campus of South China University of Technology, which requires a health certificate. This is easy to handle. You can ask the management office. The water quality is good and there are few people. Free from 6: 00 to 7: 00 every morning. There are prescribed opening hours in the afternoon.
There is also a huge swimming pool. It took less than 5 minutes to get the certificate. Let's make it seven dollars. The water quality of the school swimming pool is good, and it is a non-profit organization. It is open to the public every day, but the opening hours will be different.