Review title is Design is AWESOME, Sadly I think there is bacteria risk [SEP] Just start off with saying I did not purchase this product via Amazon I bought it at a Whole Foods near my home.  Also that I am thrilled with the design, carrying case, cleaning brush, and cap that come with the product. I do believe the design prevents back flow of mucus but I do not believe there is anyway to 100% guarantee that pathogens cannot be inhaled.  I stand here with a scratchy throat as exhibit A!  Sorry but this is not the first time I feel I directly and immediately contracted an infection through use of this type of aspirator.  First time was with the NoseFrida which is why I switched.  I thought the hose was getting old as I had had it for a year and decided to get a new frida.  When I saw the ecopiggy on the shelf I decided to chuck the filters and go with this far superior design/concept.  Well I feel think the back splash of what ever pathogens exist in my baby's mucus have found their way into my throat through inhalation.  I do not have a degree in science and I cannot deny that I may have already been infected and am just now showing symptoms but I just feel the device is suspect and have read many other similar comments. So just decided to put a public service announcement out and let people know so maybe some more research will happen to get us that 100% safe rate we want to keep using this wonderful concept!