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Old 07-03-2013, 12:05 PM   #1
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Sewer question

Hey Guys,

Having moved from a popup to a TT, I'm learning about the grey and black holding tanks. If I understand correctly, when at a 3 way serviced site, I hook up my sewer hose but leave the valve closed until the tank is full right? And then dump? The meter on the inside tells me the black water tank is 3 quarters full but when I pull the valve to empty it, not much comes out. Do you suppose it might be clogged? I use the little treatment packets that you throw down the toilet drain to break down and fight odours.

Thanks, Shannon
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Old 07-03-2013, 12:12 PM   #2
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When you get to your site you can empty the black tank then close the valve and empty the grey tank. As long as you are hooked up at your site you can leave the grey valve open but keep the black closed. As far as the black tank meter, only one way to really tell and that would be to fill the black tank through the toilet with a hose until you see it coming up into the toilet bowl. Now you know the tank is over its max capacity. See if you have adjustments on your meter to calibrate it. If it does not say full, calibrate it to full then empty the black tank for a minute or two then see if your meter is showing the level dropping or not. Good Luck!
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Old 07-03-2013, 12:22 PM   #3
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Yep!

Sounds like a clog.

Sounds like you might need one of these: Flush King - Valterra FK-01 - Sewer Flushing - Camping World

Or if your black tank has a sprayer you may be able to dislodge it that way.

Or use a chemical digester and let it sit for a day or two.

In the future use only 'septic safe' toilet paper. And plenty of water with each flush.

I learned all of these things after having to poke a cutoff hose up into the tank and dealing with the flood when it broke free. IMHO it's worth whatever it costs to avoid that.

Have fun!
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Old 07-03-2013, 04:30 PM   #4
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Grey water

I never leave the grey water valve open unless the washing machine is being used. Little bits of food from washing dishes etc. will not get sucked out of the tank unless there is a pretty good 'whoosh'. Before I started doing this the gray tank would get so stinky I had to use deodorizers almost all the time.

If I'm draining the black tank I do it first and then drain the grey to flush out the hose.

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Old 07-03-2013, 06:00 PM   #5
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That sounds like normal operation of the standard tank sensor.

Let me describe ... No imagine you drove a screw into the tank, Hooked a wire under the head and if the screw is in liquid the tank must be at least that full.. Right?

Well, perhaps, but the stuff in those tanks (both black and gray) Tends to be a bit.. well.. slimy, and the slime clings to the walls of the tank.. and...... Keeps the screw wet.

It's not a screw, it is a metal rod.. but the operation is the same

The sensors work right when the tank is new.. Sometimes if I get very serious about cleaning the sensors will work ONE TIME, but only once have I ever seen them show Empty on their own like they should.
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Old 07-03-2013, 06:12 PM   #6
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A better tankk sensor. Invent one and your children will never have to work. Actually, I build wastewater lift stations for my real job. There are accurate level sensors but they come at a price and even they have issues with grease and floaties.
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Old 07-03-2013, 06:27 PM   #7
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Had some serious browser issues ... There are Horst Miracle probes. they are supposed to not act like the screw/nail/rod above and work better, and of course See level sensors.

There are also pneumatic sensors (pressure sensors) but they too have issues.

And all cost more than the simple rod so guess what gets used.. Right, Lowest bidder.
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Old 07-03-2013, 06:33 PM   #8
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as was said, tank monitors are famous for their inaccuracies. you should never rely exclusively on them. the sensors get covered by poo/paper and tend to always show that it's fuller than it really is.

yes, leave the black tank valve closed until it's nearly full. also close the gray tank valve closed the day before you plan to empty the black tank. that way you'll have plenty of gray water to flush the sewer hose after you dump the black tank.
having a tank back flush device is great to have if you have full hookups.
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Old 07-03-2013, 06:44 PM   #9
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http://www.rvgauge.com/products/model_709.shtml

Works on non-metallic tanks. I've never had a false reading. There are no probes sticking into the tank.
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Old 07-04-2013, 07:53 PM   #10
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We don't do "full service" much, but when we do we'll keep the black closed and the gray opened....

To tell you the truth. After a week at a site where we didn't have full service, while dumping the gray, I usually think it (gray tank contents) smells worse than the contents of the black....maybe my DW and kid have "sweet poop"

We have a 25' hybrid tt.
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