Try KO from Raritan if you're looking for a deodorizer. It's a wonderful product that supposedly reacts with the methane and bacteria and goes to the order source as opposed to just masking it. We used it for several years and it worked wonderfully, while the other ones (Walmart stuff) just smelled like a restroom. We don't use it any longer since we're usually offshore every week. Our problem now is that when we pump the head we get a lot of odoriferous methane out the external vent. Everyone upwind of us has to plug their nose.
s/v "Pelican" Passport 40 #076- Finished Cruising - for the moment -
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