(as chemicals are not used, please note that it will require cleaning after 3 to 4 days use, which can be arranged if required). cancer free for 12.5 years! one would think they will want to upgrade some critical mass of cell sites before really pushing this. to judge by the event, he appears to have understood man better even than the being who made him. it’s plain and simple: these setups are the smoothest way to go, and it’s especially important to choose a design that will last a good, long while. 