this review title is: design is awesome sadly i think there is bacteria risk and the content is: 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 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 babys 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 safe rate we want to keep using this wonderful concept.there are other information for this review, one is this reviewer did not purchase it and the other is 2 people think this review is helpful.