The All in One filter catches particles down to 0.1 absolute micron. It can be used with a folding bottle, PET bottle or water tap. It is really a great help; if you want to camp out in the nature, then this gadget will definitely come in handy.
You can easily build your own gravitational filter system, which will provide you with up to 2000l of clean potable water a day. The filter's fascinating flow rate makes for 2 litres per minute.