Lightweight and compact, the SweetWater Microfilter makes water filtration fast and easy. About Sweetwater Microfilter The Sweetwater Microfilter eliminates over 99.9999% of all waterborne bacteria and 99.9% of common protozoan parasites such as Giardia and Cryptosporidium. It comes with a stainless steel prefilter, two color coded silicone hoses, foam float, water bottle adapter, cleaning brush, and carry bag. Purifier vs. Microfilter A water filter generally claims to reduce or eliminate protozoan parasites and bacteria. A filter is adequate for remote wilderness seldom visited by people. A water purifier also removes or inactivates viruses and is therefore ideal in any situation.