Roger Long wrote:
Peggie,

I see some rather pricey system for pumping air into holding tanks to
aerate them. I'd like to try rigging up my own. How much air does it
take? Is there a critical amount below which nothing useful happens
or does any air help?

The Groco Sweetank pump moves 1.7 liters of air/minute, which is about
the minimum that'll work. Two things are important: a sufficient amount
of air to aerate the contents, and piping to distribute it throughout
the tank. Otherwise it'll only push foul gasses out the vent all the
time instead of only when the head is flushed.

You can see the compete manual for the Sweetank he
http://www.groco.net/parts/data/622.pdf


I'd like to avoid the 12 volt drain. Since we are in an area where
there will usually be wake motion, I have an idea for boat motion
powered pump.

I don't think it would produce enough air. The Sweetank requires only 3
watts of 12v power...not much of a battery drain. If even that's too
much for your current 12 resources, a relative small solar panel would
replace the drain on your battery.

It's price of $150-200 seems expensive...but the purchase price is
offset by what you're spending for tank products now, 'cuz a properly
aerated tank requires nothing else. So depending on how much you're
spending for tank products, the Sweetank can pay for itself in just a
few years.


--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1