• Use with SE307, SE308.
• Can be used as prefilter for cartridge/filter, that can make your cartridge/filter
   to have a longer life.
• Before lock up your cartridge, you  put one piece of dust filter on the  top of
  cartridge/filter.
 

• Use with SE307, SE308.
• Can be used as prefilter for cartridge/filter, that can make your cartridge/filter
   to have a longer life.
• Before lock up your cartridge, you  put one piece of dust filter on the  top of
  cartridge/filter.