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 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