This inline air filter, filters out 99.99% of bacteria and viruses in the air.  It can be attached to your CPAP and BiPAP machines or CPAP Mask to deliver the cleanest air.  The disposable filter should be replaced weekly.
 
Convenient addition to your mask to help alleviate the spread of bacteria. This universal product can be used on all masks. Filter Bacteria/Viral 22mm ID-22mm OD, Opaque (KG-6300/E). These filters should be replaced every 4-6 weeks or as needed, depending on how dirty they have become.