For a better rest, use a backflow preventer

For a better rest, use a backflow preventer

 

By Russ and Tiña De Maris

The occasional letter brightens up our day and stimulates the “little gray cells.” Here we go:

fluffy-sheepDear Go-Go Gurus:
My husband is a neat-freak. He can’t stand to think about the stuff that lives in our motorhome holding tanks, and thinks that he needs to flush the tanks clean as a whistle every time we get home from an RV trip. I say he’s nuts. How can I get him into therapy? —Bea Leegered

Dear Bea:
You could try wiring up his iPod headset to the 30-amp campground outlet for a little electroshock therapy, but then again, 20-years-to-life is a long time to be away from your motorhome.

Seriously, lots of RVers like having a “Mr. Clean Approved” holding tank, but there is one thing that should be considered before you stick your garden hose anywhere you wouldn’t want to stick your lips: Backflow.

Backflow happens when a fresh water system gets “cross connected” with a source of bad water — or other contaminant. For us as RVers, it’s as simple as a garden hose, left in contact with contaminated water, hooked up to the hose bib. Under the right conditions, that water can come back UP the hose, into the hose bib, and into the fresh water lines of the house.

pukeWhat are the “right conditions” that favor backflow? Let’s say you’re flushing out your holding tank. You’ve got one of those neat “Hydro Flush” systems that let you hook a garden hose to your holding tank at the same time you’ve got a dump hose hooked up. In the middle of your dump and flush operation, the local fire department cruises through your neighborhood, testing fire hydrants. They pull the caps off a nearby hydrant, crack the valve wide open, and blast water every which way. Unfortunately, this happens at the same time you’re flushing your tank, and the sudden draw down in water pressure allows your black water to pulse backwards up the garden hose and right into your house. The same thing could happen if your private water well pump system went on the blink when you’re flushing a tank.

What’s to prevent this from happening? If hubby would buy a commercial tank cleaning system device, chances are the outfit would include a simple backflow preventer to be installed between your hose bib and the garden hose. If a sudden loss of pressure were to set up a “perfect storm” for a backflow, the device would step in and stop the backward flow of fluids, protecting your household drinking water. But oddly, not everyone sees the value of a backflow preventer. Maybe they consider it a nuisance and simply ignore it.

Ignore backflow at your peril. A mouthful of bacteria-laden water can more than ruin your whole day. But black water isn’t the only issue. Consider the harmful effects of pesticides (from using a garden hose sprayer), or automotive antifreeze (from flushing the radiator on the old bus). Backflow preventers are cheap, easy to use, and available at pretty much any hardware store. Use them and rest easier.

##RVT768

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4 thoughts on “For a better rest, use a backflow preventer

  1. Roy Ellithorpe

    The black tank flush on my Travel Supreme seemed to be plugged as very little water sprayed into the tank (going by the sound and the fact that I couldn’t get it to stop leaking at the hose connection). Over the years we have also noticed a sewer smell in the bathroom area at times.
    When I had it apart for another reason, I noticed that it had a loop that went up through the floor and into the cabinet under the sink. At the top of this loop was a vacuum breaker type valve. I couldn’t understand what the heck that would be for, so I ripped it all out and ran the line straight from the inlet to the flusher. Now I have lots of pressure on my flusher and no leaks. We haven’t used it enough to know whether the smell is gone but are hopeful.
    Can you please tell me what that was all about and why I shouldn’t have removed it?
    Thanks

    1. Russ De Maris

      Roy:

      Without getting a better picture (or diagram) of what you have/had, it’d be a little difficult to respond directly. Typically when you find a valve apparatus in a cabinet, it’s a air gap valve, typically used in RVs (but at times in sticks and bricks homes) to allow a drain to the gray water tank to be farther away from the tank’s roof vent to drain properly. If that’s what you took out, it should theoretically have no affect on water pressure to your black water flush system. I’m wondering if something else changed, coincidentally, that caused the increase in flow to your tank rinse system. How old is your rig?

  2. Nixk DiPietro

    Your articles are very informative and edgucational. You take the mystery out of alot of different problems one may encounter RVing. I for one enjoy reading them very much. Keep up the vood work.
    Sincerely
    Nick DiPietro.

    1. Russ De Maris

      Thanks, Nick. We appreciate the back-pats!

      R & T De Maris

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