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Old 09-19-2008
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IMHO, it isn't worth spending the money on the vent filter line, since it really is going to only make the problem worse. The problem is that you probably don't have sufficient ventilation for your holding tank, and adding a filter is going to make that worse, not better. The odor-causing bacteria are anaerobic, and if you increase the ventilation to the tank, it won't stink, since the good aerobic non-sulfide producing bacteria will multiply and the sulfide producing anaerobic bacteria will die off.

Another problem with stinking holding tanks is when you flush using seawater, since the seawater often contains small lifeforms that will die and decompose, adding to the smell...but that usually is more a problem in the hoses than the holding tank itself.
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Telstar 28
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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