The worst smell is when the boat is sitting and all the algae in the *intake line* rots. Then the first time you pump it the smell could knock a buzzard off a septic tank truck. One stopgap for smelly hoses is to get tea tree oil and spray the hoses down with it. It does a decent job killing organic odors. If you want to be scientific, bubbling oxygen through the holding tank would be a help too. Anaerobic bacteria have an output of hydrogen sulfide and aerobic bacteria do not. Joe Coquina
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