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Old 08-21-2013, 06:24 AM   #15
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I use the same hose for both.

I trust gravity and the back flow preventer.


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Old 08-21-2013, 06:32 AM   #16
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I use the same hose for both.

I trust gravity and the back flow preventer.
To each his own, but I use a separate hose to flush my black tank. I won't hook EITHER end of my fresh hose to anything containing non-potable water. Excrement doesn't flow uphill, but bacteria CAN grow uphill!
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Old 08-21-2013, 06:49 AM   #17
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No, it doesn't - at least not on any trailers I've seen. The pipes from the gray tank run to the same sewer connection, but it doesn't pass through the black tank on the way.

What the previous posters were describing is that the gray tank flush will 'clean' the sewer hose after dumping the black. The gray tank itself doesn't do anything for the black tank.

You do only dump one tank at a time, right? The normal procedure is to dump the black tank, let it finish, close the valve, then open the gray tank. Also, you shouldn't feel shy about putting more liquid in the black tank to help it dump and keep things from solidifying in there. Some people fill it up with water every time before they dump; I don't think that's quite necessary, but you should have a good amount of water in there. (Note, some newer trailers have the bathroom sink draining into the black tank, which is a GREAT idea for helping to (a) get more liquid in that tank, and (b) reduce the odds of filling the gray tank, which is a common problem.)
If you empty the black water tank and then open the gray water tank valve with the black water tank valve still open, the gray water will fill the black water tank to the same level as in the gray water tank and although the gray water does not "pass through" the black water tank, it does help flush out the yucky stuff. Before I open the gray water valve, I dump 2 stools full of fresh water into the black tank.
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Old 08-21-2013, 06:55 AM   #18
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Planning a fairly lengthy trip; I do not want to carry any more hoses than I need to.

Is there any real danger in using the water hose to flush the sewer?
You know, it is just not a good idea, IMO.

You could inadvertently touch the fresh water hose to something contaminated.....and you just don't want one of those intestinal distress issues which could result if your fresh water hose became a conduit.....

Most dump stations have a non-potable water hookup, for rinsing in addition to your grey water flushout.


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Old 08-21-2013, 07:13 AM   #19
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Most dump stations have a non-potable water hookup, for rinsing in addition to your grey water flushout.


Maggie

Most campground dump stations I've visited have a hose for rinsing down the slinky and outlet area but they've been specifically modified to prevent any connection to anything else. This is presumably because it's non-potable water and they don't want you connecting it, albeit accidentally, to your city water inlet. The down side is, of course, that you can't then connect it to your tank flusher system. I think I've only ever used the tank flusher once, for that reason.

I did purchase a Sewer Solution and that provides a reasonable flush system for the blank tank; the very obvious results are visible though the clear plastic connector. The Sewer Solution is best, though, when you have a full hookup as it can be a little slow, so I'm not sure I shall be using it at the dump station. When I have to employ the slinky I will rely on the additional water added to the tank in order to keep things fluid.

On the original question, I carry a different coloured garden hose for all non-potable water situations, just to be on the safe side.
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Old 08-21-2013, 07:29 AM   #20
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Most campground dump stations I've visited have a hose for rinsing down the slinky and outlet area but they've been specifically modified to prevent any connection to anything else. This is presumably because it's non-potable water and they don't want you connecting it, albeit accidentally, to your city water inlet.
You know what makes that connection non-potable? Proximity. It's actually the same water you get at your campsite, except it's too close to the sewer pipe at the dump station. Underground potable water plumbing has to be a certain distance from any sewer or septic system plumbing; the exact distance varies by the state that has jurisdiction. One reason why so many campgrounds have water/electric only; it's a lot easier to figure out where to run the water lines throughout the campground if you don't have to worry about where the sewer lines are.

If public health regulations are concerned about contaminated water moving through soil from a sewer pipe to a fresh water pipe if there's a break in the lines, it only makes sense to be concerned about spreading contaminants through direct contact by using a fresh water hose to flush a black tank. Accidentally drop either end of your fresh water hose once anywhere near the dump station where slinkies have been rinsed out and it will never be a potable water hose again because you'll never be able to trust it.
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Old 08-21-2013, 08:50 AM   #21
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If you empty the black water tank and then open the gray water tank valve with the black water tank valve still open, the gray water will fill the black water tank to the same level as in the gray water tank and although the gray water does not "pass through" the black water tank, it does help flush out the yucky stuff.
I wouldn't do this. There are some places where you can let graywater run on the ground, but your gray tank may now be contaminated with stuff from the black tank. (On the other hand, gray water is gray because of the soaps in it, so it seems like there'd be a good cleansing action...)
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Old 08-21-2013, 08:52 AM   #22
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You know what makes that connection non-potable? Proximity. It's actually the same water you get at your campsite, except it's too close to the sewer pipe at the dump station.
Thanks! I've always wondered what made that water unsafe. I was pretty sure they weren't putting anything into it (at least not intentionally)...
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Old 08-21-2013, 08:55 AM   #23
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You know what makes that connection non-potable? Proximity. It's actually the same water you get at your campsite, except it's too close to the sewer pipe at the dump station. Underground potable water plumbing has to be a certain distance from any sewer or septic system plumbing; the exact distance varies by the state that has jurisdiction. One reason why so many campgrounds have water/electric only; it's a lot easier to figure out where to run the water lines throughout the campground if you don't have to worry about where the sewer lines are.

If public health regulations are concerned about contaminated water moving through soil from a sewer pipe to a fresh water pipe if there's a break in the lines, it only makes sense to be concerned about spreading contaminants through direct contact by using a fresh water hose to flush a black tank. Accidentally drop either end of your fresh water hose once anywhere near the dump station where slinkies have been rinsed out and it will never be a potable water hose again because you'll never be able to trust it.

In concept you are absolutely correct, but you could take the suspect hose and coil it in a five gallon bucket with an appropriate chlorine solution and soak it. If carefully coiled, you can get all the air out of the hose while submerging it. BUT, keep the fresh equipment as far away from the black equipment as possible...and always be conscious of it.
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Old 08-21-2013, 08:58 AM   #24
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Speaking of proximity of black to potable water connections, my external sewer flush connection is only inches above the external water supply connection.

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Old 08-21-2013, 09:00 AM   #25
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Speaking of proximity of black to potable water connections, my external sewer flush connection is only inches above the external water supply connection.

doug

Yeah, and only about a foot from the dump connections. Care is needed.
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Old 08-21-2013, 09:01 AM   #26
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I wouldn't do this. There are some places where you can let graywater run on the ground, but your gray tank may now be contaminated with stuff from the black tank. (On the other hand, gray water is gray because of the soaps in it, so it seems like there'd be a good cleansing action...)
Gray water is gray because it's been used, whether it has soap in it or not. Black water is black because at least some of it came out of a person, and so may contain human pathogens.

But that's just pedantery. Your point is well taken. Just like in Ghostbusters, don't cross the streams, or bad things will happen. If you allow gray water to flow into your black tank through a connection without a check valve, strictly speaking from then on you no longer have a gray tank; you have two black tanks.
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Old 08-21-2013, 09:03 AM   #27
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I forsee I will be spraying alot of stuff with bleach solution!

That is annoying that the dump station hose does not fit often on tank flusher...I think many of the hookups in my neck of the woods are full hookup....at "full hookup" sites...is there two different spiggots - one for potable and for tank flush/etc? Seems like I recall there only being one...which would require you to use a Y bracket I suppose...

MrUKToad - im a bit confused...when you use your sewer solution at a dump station...if that water hose will not fit for tank flush, it still will allow the hose for the quick disconnect for the ss? If so, you could disconnect that hose...put on tank flush....flush.....then re-connect it to the ss? sorry, bit of a tangent.
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Old 08-21-2013, 09:04 AM   #28
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Speaking of proximity of black to potable water connections, my external sewer flush connection is only inches above the external water supply connection.

doug
Hope it's actually the other way around, with your sewer flush connection BELOW the external water supply connection. Fresh always above waste, so gravity flows from clean to dirty.
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