F Murtz wrote:

all in
Australia use and have used 2% or 5% (copper silver phosphor alloy)For
joining copper pipes extensively in normal water piping for residential
and commercial for years

How much tin does Australia mine? Could it just be you have lots of
copper/phosphor and silver is what makes those work in combination as a
solder?

I have been assuming that we just copied places like the UK but it seem
we are ahead and copy world best practice instead of the old

Yet you don't know if or how it's "better"?