10 micron - provides very fine filtration. It filters soft water with very little external contamination. You can use the 6 micron filter bag when your pool is relatively unused. It captures impurities for clear, transparent water, thus offering perfectly crystal clear water. This bag requires regular maintenance and cleaning. 15 micron - recommended during the season under normal pool use conditions. It therefore provides balanced pool water throughout the summer. Depending on how dirty the bag is, you can easily clean it with a jet of water. 30 micron - ideal at the beginning of the season to restart your pool and during winter storage. It can also be used for dirty, unbalanced pool water or to combat green water. This bag requires less frequent maintenance and cleaning than other bags. You can easily clean it with a jet of water, or put it in a washing machine without detergent/laundry detergent at 30°C (max).