Because the outlook for this condition is so dire, prevention can be important, even though the condition is very rare. These are key things to remember: Don’t swim, wade or do watersports in warm freshwater locations, especially still waters, without nose plugs. Don’t go into the water at all if Naegleria fowleri is known to be present or likely to be present. Don’t use tap water for a neti pot or any other device that cleans your nasal passages. Only use distilled or sterilized water. If you must use tap water, make sure that you boil it for one minute and then let it cool. If you live somewhere that’s 6,500 feet above sea level, boil the water for three minutes and let cool. You can use filters to remove germs from water. Use filters labeled “NSF 53,” “NSF 58” or “absolute pore size of 1 micron or smaller.” You can also use chlorine bleach liquid or tablets to disinfect your water for cleaning your nose and sinuses. Disinfecting water for nasal use requires a different amount of bleach than disinfecting water for drinking. If you do develop symptoms of fever or headache after going into warm freshwater, tell your healthcare provider where you’ve been.