It is important to know that the pool filter must be sized according to the size of the pool and the amount of water (m³), as every pool needs a minimum filtering time according to its size, so that all the water passes through the filter and return clean. In the case of residential pools, this time is 8 hours a day and, in collective use, it is important that the system has the capacity to filter all the water in the pool in just 6 hours. The flow capacity of the filter set (motor pump / filter) must be well dimensioned so as not to waste time and energy.