Pack contents: 2 filter bags: 1 filter 15 microns and 1 filter 30 microns; dimensions 58x33 cm with a rigid ring of diameter 21 cm. Compatible with Desjoyaux filter blocks F15, PF180, PFI180, PFI181, PF250 as well as any system using a 58x33 cm bag with a rigid ring Ø21 cm (Not compatible with the GR.I 110 system or above-ground pools). This set allows you to adjust the filtration according to the condition of your water. The 15-micron bag is ideal for regular maintenance and offers an excellent balance between filtration fineness and water flow. The 30-micron bag is recommended for more loaded waters, pool restart, or winterization, thanks to a wider filtration that requires less maintenance. Easy to clean with a water jet or in a machine at 30°C without detergent. Also available in 6 microns for ultra-fine filtration. Compatible product, not manufactured by Desjoyaux.