After the carrying out the "Backwash" operation on the filter and placing,the water flowing into the swimming pool will be cloudy for a few seconds,so to prevent it from reaching the swimming pool there is a "Rinse" position for the selector valve which is operated as follows:immediately after the "Backwash" put the valve in the "Rinse" position and switch on the pump for 1 minute, after which the pump is switched off and the valve placed in the "Filtriton" position