10 microns – allows for very fine filtration. It filters soft water with very low external pollution. You can use the 6 micron filter bag when your pool is relatively unused. It retains impurities for clear, limpid water and thus offers perfectly crystal-clear water. This bag requires regular maintenance and cleaning. 15 microns – recommended in season under normal pool usage conditions. It thus offers you balanced pool water throughout the summer. Depending on how dirty the bag is, you can simply clean it with a jet of water. 30 microns – ideal at the start of the season for restarting your pool and during wintering. It can also be used for loaded, unbalanced pool water or to catch up on green water. This bag requires less frequent maintenance and cleaning than other bags. You can simply clean it with a jet of water, or put it in a washing machine without cleaning products/detergent at 30°C (maximum)