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Date:         Fri, 1 Oct 1999 10:40:10 -0400
Reply-To:     Bulley <gmbulley@BULLEY-HEWLETT.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Bulley <gmbulley@BULLEY-HEWLETT.COM>
Subject:      more about PVC grey water tanks...
Comments: To: Malcolm Stebbins <Malcolm.Stebbins@MSVU.CA>

Something I learned from the lady at Raritan Engineering...the reason that some RV or boat septic systems stink is lack of ventilation. Without O2, the natural bacterial action goes anoxic, and smells putrid. The trick is to have "flow throw" ventilation on the tank, keeping a fresh supply of O2 in contact with the waste. Further, you need to be able to flush out the tank once it is emptied. Therefore, I'd be hesitant to use a series of pipes.

Of course, all that is good and well if you plan to keep your dirty sink water in the tank for a few days or more...I am thinking of this tank as meanly a "quickie" holding tank, so when we stop along the Blue-Ridge parkway to cook breakfast, we don't leave a trace. The extra capacity would be for those times when we camp with another couple for a couple days, or have to live in the camper after a hurricane, etc.

G. Matthew Bulley Director Bulley-Hewlett & Associates www.bulley-hewlett.com Cary, NC USA 888.468.4880 tollfree

-----Original Message----- From: Malcolm Stebbins [SMTP:Malcolm.Stebbins@MSVU.CA] Sent: Friday, October 01, 1999 9:25 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: PVC grey water tanks...

Rather than "snake" it back and forth, make it like a house radiator:

||================|| ||================|| Sink ||================|| ||================||

( artistic note the || & || are all connected) It must drain to the rear (one would want the water to settle in the low point), because if it drains to the front, you will get airlock and the sink will not drain properly (maybe not at all). malcolm s

W. wrote:

> The only thing I can't figure out is how to keep the water from setteling in > the low point - that is from where you come off the gray water tank, go lower > and travel across the van back up to the sink drain fitting on the other > side. Water seeks its own level so you would always have water in the line > between the sink and the gray water tank-you wold also need a "trap" of some > sort ( with a clean-out) or you would constantly have that "grey water > smell" inside you van.


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