Hi ag1, I was wondering (as you probably know more about this!) have you heard of the reverse osmosis filter system? any thoughts on that would be most appreciated.

"Reverse osmosis is a process in which the incoming (dirty) water is forced through a special cellophane-like RO membrane under elevated pressure. The hole size in an RO membrane is less than 0.0002 microns (2 Angstrohms). "

found the above snippet from a website