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 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 Walk-Man 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 should be considered before you stick your garden hose anywhere you wouldn't want to stick your lips: Back flow.
Back flow 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 in to the fresh water lines of the house.
No backflow preventer? YUCK!
What are the “right conditions” that favor back flow? 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 was to buy a commercial tank cleaning system device, chances are the outfit will include a simple back flow 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 back flow, the device steps in and stops the backwards flow of fluids, protecting your household drinking water. But oddly, not everyone sees the value of a back flow preventer. Maybe they consider it a nuisance and simply ignore it.
Ignore back flow to your peril. A mouthful of bacteria laden water can more than ruin your whole day. But blackwater isn’t the only issue. Consider the harmful affects of pesticides (from using a garden hose sprayer), or automotive antifreeze (from flushing the radiator on the old bus). Back flow preventers are cheap, easy to use, and available at pretty much any hardware store. Use them and rest easier.
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