And it might just be the screens. When I have a good dock hose available, I'll stick the hose right up against the vent on the outside and push water back down the vent line. It blows any salt buildup off the screens. I've also noted that the screens will turn green and crusty just from the environment or even gasses that are being vented.

It's possible that the hose is clogged with detritus, or even little hunks of toilet paper. Those vents have nipples on the inside of the hull, and you can pull the hose off.

*I offer this advice with a strong warning:* You can get fittings at many hardware/plumbing/garden stores that take a standard garden hose end and fit various hose sizes. (I have one that fits my primary bilge pump hose, that I occasionally connect to give it a high pressure flush to remove sediment.) You could connect one of those to your vent line and back flush into the tank. *NOTE:* 1) You should loosen the main tank inspection port or you will blow up your holding tank up with horrible consequences. 2) City water pressure from a garden hose may be too much for your hose and fittings. I don't want to do the math, but I think if you take 40 PSI from the city and push it through a 1/2" vent hose the pressure increases big time. So open the faucet up just a little bit and listen through the inspection port.

Yes, it will get stinky, but stinky goes away sooner or later.

Wal


On 11/4/2013 8:02 PM, Rick Brass wrote:
As I recommended before, look for a plugged screen in the vent on the
outside of the hull before you look at anything else. Unless you don't have
spiders and wasps where you live.


--
s/v Stella Blue
www.wbryant.com


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