A sterile device designed to remove bacteria and other suspended particles from flowing water by creating a mechanical barrier to elements larger than 0.2 micrometres. It typically consists of a plastic housing with a connector to the water source [e.g., a tap (faucet)] and a 0.2 micrometre filtering membrane [e.g., made of nylon, polyvinylidene fluoride (PVDF), or polyethersulfone (PES)]; a prefiltration of the water to remove larger particles is typically recommended. It is typically used for hygienic and surgical hand washing, wound irrigation, and/or rinsing of medical devices. This is a disposable, non-sterilizable device which may serve multiple patients before being discarded.