Case study of indoor counter current swimming pool equipment in Guangzhou. Counter current swimming pool is a type of swimming pool design that adopts a special water circulation system. In the counter current swimming pool design, the circulating water of water is carried out through overflow grooves on both sides or the surrounding walls of the pool. The overflow water above the water surface is guided to the return water outlet and enters the balance tank (also known as the balance pool) through the pipeline system. Then, the water is pumped out of the balance tank by the circulating water pump and sent to the filtration and disinfection equipment for treatment. This design allows the dirt, grease, and some suspended particles on the surface of the swimming pool to naturally overflow into the overflow tank with the water flow, thereby improving the cleanliness of the water quality. A counter current swimming pool has certain requirements for the location and structure of the computer room. Generally, the computer room should be located below or adjacent to the swimming pool to facilitate gravity drainage and pump pressurization to lift the water. The corresponding civil engineering costs and equipment investment may be higher than those of a downstream swimming pool.