Nature 2?

[waterbear]

I think the most compelling evidence is that Austrailia does not allow copper/silver systems in swimming pools without STANDARD FC levels!
(The second url below is MOST informative!)

http://www.apvma.gov.au/qa/poolspa_Q&A.shtml

http://www.apvma.gov.au/qa/poolspa_FAQ_May2005.shtml

http://www.apvma.gov.au/qa/poolspa_FAQ_May2005.shtml

There goes the N2 Spa recipe that uses only MPS!

I only wish our own EPA was as diligent!