Out of curiosity what is reverse osmosis? Osmosis is "The diffusion of water across a semi-permeable membrane along a concentration gradient" (yay 4th-5th year Biology... I wrote that so many times) so what does the reverse bit do? Googling it seems to turn up Osmosis results (
How Stuff Works).
Edit- Found it, reverse osmosis takes salt/other water and reverses the osmosis process... basically rather than taking nice clean water and filtering it we waste a lot of power/time cleaning dirty water, thus polluting more of our nice clean water... odd concept but if it pays!
In Britain our tap water is pretty nice, even through the lead pipes in my house (not been replaced since 1902 when the house was built!). Bottled water always seems a little like a con, it does seems safer than what comes out of some of my taps (its often slightly brown but perfectly healthy) but the cost is stupidly high... and isn't the only cost/pollution efficient recycling (other than bio matter) aluminium?