Coloplast Filtrodor Pouch Filters are a charcoal filter that adheres to your ostomy appliance for added protection against odors from your stoma. Odor is neutralized when gas passes through the carbon filter. Easy to use, the filter is adhesive and attaches easily to the ostomy pouch. Perforations (to express gas through the filter and out of the pouch) are made with the special pin provided. Minimizes “ballooning” – the automatic gas outlet regulates the pressure in the pouch. Adjustable flow rate – the capacity of the filter can be increased by making extra perforations between the pouch and filter.