Bill Kearney wrote:
But won't the vinegar also kill the useful treatment bacteria?

Nope. A cupful, even once a day, isn't enough for the bacteria in the
tank to notice 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://shop.sailboatowners.com/boat_odors/