Try digging one in most of Florida, without it being under water.
Hell, when they built the new Walmart superstore in Ocala a few years
ago they found a cave that led directly to the Florida aquifer. They
had to stop construction and pump it full of concrete to support the
weight of the building that would sit over it. A few of the real old
timers just laughed and told them they used to play in those caves back
in the '30s & '40s, before the entrance was sealed. It isn't too far
from Silver Springs with the underground springs, and Artesian wells.
"Hard water [with minerals in it] will break down a water heater. Get
soft water [minerals removed]." "In many cases, installing a water
softener can [also] help reduce wear and tear on the plumbing due to
-- http://homeshowradio.com/water-softener-install-aquatex-2 /
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