Low water consumption.
The cartridge filter system does not require backwashing as a sand filter system does. You only need to flush the cartridges which can be done with a fraction of the water of a backwash. The refilling of the pool water will be done by the rain. If it does not rain for a longer period of time, the skimmers compensate for a water level of 20cm. This corresponds to 3.4 m3 of water. You can also use rainwater from the roof of the house or garage to fill the pool.