sded wrote:
It's amazing how much good a gallon of vinegar a year does for each head.

A cupful flushed down it once a week is all it takes to prevent mineral
buildup in the hoses. Also helps to retard odor permeation in hoses.
Adding more than that at a time is just a waste of vinegar...it just
gets flushed all the way through the system into the tank or overboard.
And less often than once a week isn't often to prevent buildup, though
it does dissolve at least some of it.

Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/html/get_ri...oat_odors.html