> re: RO - I saw an add a couple of years ago for an impressive-looking
> unit.  Alas I can't remember the specs, but it was 500 and something
> pounds.  But that doesn't mean a lot as I don't know whether it was
> top, bottom or middle of the range.  They don't come cheap though.
>
>        Happy growing,
>                Peter
I went from collecting rain water to an RO unit.  -More consistent
supply without the worry of contaminated water from the first flush of
rain coming off a dirty roof.  There was a noticeable improvement in the
growth of sphagnum for me.  My Ro unit came from a company in Sarrasota,
FL.  I also have info from a place out in California, mine cost about
120$ and produces maybe 35 gallons in 24 hours. 
Tom in Fl.