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Use manual drain overflow :
Used for swimming pool with large surface area from 250 – 300 m2. A balanced tank should be used to regulate water balance
+ Advantages: high water level with tiger swimming to create beautiful space, focus on good recovery of dirt in the balance tank through the spillway,
The filter is more efficient than the skimmer because the water mixes evenly,
+ Disadvantages: There must be a spillway around the drain and a balanced tank that takes up space