Ultimate DIY Water Filter! This Homemade Water Purifier is extremely effective and super easy to make. The 2 Stage design purifies almost all water sources to 99.999. Starts to produce cleanclear (super hot) water within 20 seconds! uses no electricity. great to have in a SHTFEmergency situation or for everyday use. *also doubles as a water heater and stove burner!. you can cook on top of the coil at the same time the water is heatingpurifing! water purifier, water heater and stove all in one! *and with the exception of the ivated carbon and the copper coil, the filter is made almost entirely out of free stuff (recycledreused metal cans, plastic bottle, glass jar - along with sand and gravel). note that the 1st stage of the filter (ivated carbon part) removes predominantly the chemical impurities (along with bad tastecolorodorsediment). while the 2nd stage (heated coil) predominantly removes the biological contaminants (parasitesberiaviruses etc.) when used together theyre extremely effective as a filtering system. should purify almost all water sources. note - one of the few things it wont remove is salt from salt water and certain minerals. of interest: total length of copper tubing is 10 ft. tubing is 14. a crumpled up piece of coffee filter paper can be used in place of the cotton balls. i was able to purifiy 12oz of water every 3 mins or so (about 12 gallon every 15 mins). it uses about 25 cents worth of 70 isopropyl alcohol to purify a gallon. (i imagine in a pinch, since the can that holds the copper coil is very similar to a tin can stove, you could use small sticks, twigs and leaves as a fuel source instead of the alcohol). Of note: it only steams up for a few seconds every few minutes or so. most of the time the flow of escaping water vaporsteam is light and barely visible.