On Sun, 3 Jan 2010 13:40:25 -0800 (PST), "
wrote:

On Jan 3, 7:54*pm, wrote:



Some articles say that the substitutes will cost a small premium, but
this http://www.klsupply.com/Dealer/KLSup...NOUNCEMENT/Cal...
says it will cost less, which makes the change a no-brainer and
probably long overdue. I had to chuckle though - some folks are having
to replace galvanized drop pipe in their wells due to the risk of zinc
contamination. Yet at least some of the new wheel weights are zinc. I
guess it's all about relative risk.

Wayne

Zinc is not a big health risk.

http://news.discovery.com/earth/drin...amination.html
No more galvanized allowed in new or refurb commercial wells in AZ,
and probably most other places.

But I doubt if the substitutes will
cost less.

The vendor referenced in my previous post already sells them for
"substantially" less.
http://www.klsupply.com/LinkClick.as...k=284&tabid=36

If they did cost less, those filthy capitalists would have
already made the change.

Not hardly. Small business is notoriously slow to change its ways.
Lots of HVAC outfits are still sitting on the fence about heat pumps
for gawds sake.

Zinc deficiency
From Wikipedia, the free encyclopedia

Zinc deficiency is a lack of sufficient zinc to meet the needs of
biological organisms. It can occur in both plants and animals. Zinc
deficient soil is soil in which there is insufficient zinc to allow
plants to grow normally.

Most people get enough zinc by eating a normal diet. I don't know the
relative risk of zinc leeching into ground water, but anything even
slightly troublesome but not controlled, is going to be a problem in
some specific places even if it's not a problem overall. For example,
if your well is red-tagged due to runoff from a road, you're not going
to be placated by claims that it's generally good for plants.

Wayne