[Public-List] Holding tank question

[Jason S]

Good info john, real good. I am making a new tank now and I only had one
vent.... gonna try 2. Thanks again
On Mar 4, 2013 4:26 PM, "John Riley" <jriley at dsbscience.com> wrote:

> We also have two vent lines led to the bow as shown on the maintenance
> page on the A30 site.  Works like a charm and no odors.
>
> That's the thing...according to Peggy Hall ("The Head Mistress"), it is
> inadequate ventilation that causes odor.  Aerobic decomposition products
> don't 'smell.'  The problem, according to her, with single line vents is
> that it does not let adequate air flow for aerobic decomposition.
>
> Like several others on this list, I decided to try this strategy, and I
> must say I am a believer.  I installed our head 5 years ago and we lived
> aboard for 3 of those years.  That's four people using one head and one
> holding tank.  Keeping the head itself clean and odor free was more of an
> issue than the tank ventilation.
>
> If you think about it, it's also at least part of the principle behind
> composting heads like the Air Head.  The only difference is that they use a
> fan to force air into the system.
>
> Two vent lines, one on each side, that allows one to be intake and one
> outflow allows for a constant stream of fresh air into the take...and
> aerobic, odor free decomposition in the tank. Decomposition always occurs.
>  Enough air flow = no odor, not enough air flow = a stinky mess.
>
>
>
>>  Any odors ever waif back from the bow?
>>>
>>
>> Not on deck, anyway.
>>
>>  - George
>>
>>
> --
> John S. Riley
> S/V Gaelic Sea
> 1972 Alberg 30 #521
>
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