Two holding tank vent lines?

[gac1982]

Peggy,
In an old post I read, you said "Nor do I even recommend two vent lines in all installations...often one will do just as much." I read something in Practical Sailor recently (or it might have been Cruising World) where a contributor said he installed a second vent line with a solar fan to draw air into the holding tank, and the other vent line allows it to flow out. Is a setup like that unnecessary, or would it be more likely to keep things smelling sweet?
GAC

 

[Peggie Hall HeadMistress]

There is no "one size fits all" venting solution

In 90% of installations a single 1" or 1.5' single vent line is all that's needed. If it's not, we can spec out the right answer for YOUR boat.

 

[Bruce Gorle]

Hi Peggy
After reading your book How to get rid of Boat odors, I purchased a new aft holding tank for my Catalina 42. I had Ronco install a 1.5 inch vent in addition to the 5/8 inch vent. I still get BAD odor from the holding tank when flushing and realize that I have the anaerobic bacteria instead of aerobic, which means more fresh air. I wonder if there is a 1.5 inch blower that I can install and connect to 12 volts? as being at the bak of the boat not much air is blown in by natural means. I would appreciate any advice as the "Admiral" is ready to mutiny.
Thank you
Bruce Gorle

 

[Peggie Hall HeadMistress]

You're on the right track with a 1.5" vent...

But apparently the vent line routing defeats the whole purpose of going with a larger diameter vent line. I don't think you need a blower...just some vent line modification and maybe a different tank product.

But if you did need a blower, it shouldn't push air into the tank, it should PULL air through the tank.

Send me an email (EMAIL, please, not a PM) and let's get set a time when we can talk instead of swapping 15 emails apiece.

 

[Bruce Gorle]

Hi Peggy
sorry I can't see how to email you,can you send me an email?
Bruce Gorle

 

[Lee Coller]

Click on her name, then click on the "Contact Info" tab.

 

[Peggie Hall HeadMistress]

We've connected...

...And hopefully solved his problem by just changing the way he was using Odorlos (too little, not often enough). He'll report back and let us know.