holding tank copper tube SM

Mike Ondra <mondra@...>

After losing our ability to pump out the toilet we discovered the
copper intake tube at the bottom of the holding tank was 3/4 blocked
by a hard crystaline substance deposited on the wall of the pipe.
This could be chipped away with a straight screw driver to the extent
that the screw driver could be leveraged up the pipe (maybe half way)
which seems to extend to near the top of the tank.

This boat has been in service 6 years, mostly in the Caribbean, with
sea water flush. Any ideas of what causes the buildup of such deposits
(combination of copper, salts, and ammonia from urine?)or experience
relative to its removal?

S/Y Aletes SM#240

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