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Swimming pool water circulation method
Published:
2020/06/04
There are two commonly used circulation methods for swimming pools: one is the flow-through method, and the other is the counter-current method. Due to the different technical characteristics of the two methods, the correct choice must be made in actual engineering projects in combination with the use of the swimming pool. Avoid blindly following rules.
The flow-through method uses a circulation method where water enters from both sides of the pool wall and returns from the deep end of the pool bottom. Specifically, inlets are set in the center of the pool wall directly below each lane line on both sides, and several outlets are set at the deepest end of the pool bottom. The number of inlets is twice the number of lane lines, and the number of outlets is equal to the number of lane lines. The flow-through method actually simulates the movement of a natural river, allowing treated water to push used water (i.e., new water pushes old water) into the water treatment equipment, thus avoiding the mixing of new and old water. Advantages of using the flow-through method: ① Simple pipeline layout, no need for additional equipment such as balancing tanks, low management and maintenance difficulty, and low investment cost; ② No need to increase the circulation water volume, high water treatment system efficiency, and low operating cost; ③ Overflow water from the overflow gutter is not reused, and floating objects on the surface of the pool water can be discharged from the pool through the overflow gutter on the pool bank, fundamentally eliminating secondary pollution sources. The main disadvantage of using the flow-through method is that due to the small number of inlet and outlet ports, the overall water quality (water temperature, residual chlorine, turbidity) of the swimming pool is not as uniform as the counter-current method;
The counter-current method uses a circulation method where water enters from the pool bottom and returns from the pool bank overflow. Specifically, a water distribution port is set every 3 meters on the projection line of each lane line at the bottom of the pool, and overflow gutters are set on both sides of the pool. It actually adopts an upward water distribution method, that is, water enters from the pool bottom and pushes towards the surface, and finally returns to the water treatment room via the overflow trough on the pool bank. Advantages of using the counter-current method: ① The overall water quality (water temperature, residual chlorine, turbidity) of the swimming pool is more uniform than the flow-through method; ② Floating objects on the surface of the water near the pool edge can be collected and returned to the water treatment system via the overflow trough on the pool bank. Disadvantages of using the counter-current method: ① The pipeline layout is very complex, and supporting equipment such as balancing tanks needs to be set up, resulting in a large workload for management and maintenance, and the investment cost is much higher than that of the flow-through method; ② The water near the pool edge returns to the water treatment room via the overflow trough on the pool bank without being used (forming a short circuit), while the water in the center of the pool must go through several circulation cycles before returning to the water treatment room. When the number of swimmers increases sharply and the amount of pool water pollution increases, the water treatment efficiency is much lower than that of the flow-through method; ③ Swimmers often use the overflow trough as a spittoon, making cleaning very difficult and causing serious secondary pollution to the pool water;
Based on the advantages and disadvantages of the flow-through and counter-current methods, the following conclusions can be drawn: ① For star hotels, high-end clubs, and Olympic venues with a small number of users, due to the small number of users and few sources of pool water pollution, and the users have higher requirements for the uniformity of the overall water quality of the swimming pool, the counter-current circulation method is recommended; ② For public swimming pools with a large number of swimmers and open to the public, due to the large number of users and a large amount of pool water pollution, the goal of the water treatment system is to quickly reduce the overall amount of pollutants in the swimming pool within one circulation cycle, so the flow-through circulation method is recommended.
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