I swim all the year round, and I have been to all the swimming pools in Hohhot. Finally, I basically chose Zhaojun, where the water is warmer and there are not many people. Every time you buy 15 yuan, you can bargain with them.
There are also hot spring swimming in Shuiyue City, and there are few people. The water temperature is average, but there are few people. Ticket price 15 yuan. It seems that you can still apply for an annual card.