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Stinking head, Pearson 28
Peg Hall has written one of the most elegant comprehensive ''boat sanitation guides''::: http://www.boatsafe.com/nauticalknowhow/phall.htm
The Pearson 28 was not originally built with a holding tank and probably the home built system on board this boat is ''permeating'' through the hoses, etc. necessitating a complete replacement of most of the components (by the present owner). A simple quick-fix solution is to completely open the vent to atmosphere to permit aerobic fermentation of the contents and then add some "ODOR-LOS" (available at most marine suppliers) which will accelerate the fermentation - should get rid of 99% of the ''smell''. Most holding tanks on boats are wrongfully constructed with inadequate venting .... and will result in considerable permeation and STINK. Go to Peg''s site for a full ''laymans'' description.