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post #7 of Old 06-18-2007
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Actually, one article I read (I think here on Sailnet) recommend two vent lines - the size is less important than the fact that you will get some flow with two opposite facing vents (i.e. one facing fwd, one facing aft) so that the breakdown of waste in the tank is aerobic vs nonaerobic (not stinky vs. stinky, respectively.) I have a single vent to a small deck fitting on my tank now, presumably similar to what's described above, but when I put the tank back in (after rebuilding my head this year and replacing the Groco with a Lavac) I will add a second vent line.
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