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?

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.

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Roger Long