purple == grey

While biking around some new developments in the FL gulf coast area
today, I noticed a bunch of piping and fittings laid through the
ground and terminating near where each lot goes, all colored purple.
There were some larger purple pipes nearby, looking like the typical
Florida deal where water pipes rise from the ground, pass through
a couple of check valves, and go back in -- no frost worries. Those
are usually blue, but these were purple. I figured it was another
color code, but immediately discarded the idea of natural gas since
a lot of the piping was PVC. I also spotted a couple of purple
cover plates labeled "REUSE".
.
Googled for "purple" and "reuse" and "water" and "construction" later
on, and found that yes, purple is the official color for reclaimed
greywater that can be recovered, minimally treated, and used again
for non-potable applications such as irrigation, toilets, etc. It
requires building two parallel drainage and feed systems in each
house and neighborhood, but the costs are evidently minimal and it
saves a heckuvalotta water.
.
This is awesome. Now, all they need to do is start recovering *heat*
from laundry and sink and shower drains before the stuff goes to
treatment...
.
_H*