There is no clear answer to this question. This always depends on the pool size, the pump output, the number of people using the pool, outside temperature, frequency of rainfall, etc. The saltwater system produces chlorine, but does not affect other water parameters (pH, hardness – calcium and other minerals, alkalinity). We always recommend that you measure the water parameters with test strips during the first filling and before starting any equipment, so that you know what the baseline parameters are. During the initial period, test the water more frequently and adjust the operation time of the filter pump and saltwater system. Treat the water with pool chemicals if necessary.