Coast Resorts Open Roads Forum: Black Tank only holds 1/2 to 1/3 of capacity
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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Black Tank only holds 1/2 to 1/3 of capacity

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opnspaces

San Diego Ca

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Posted: 09/12/23 10:13am Link  |  Quote  |  Print  |  Notify Moderator

Maybe dump the tank and look down the toilet before you add any water. Can you see the bottom of the tank or is there a buildup?


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TexanSon

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Posted: 09/12/23 10:37am Link  |  Quote  |  Print  |  Notify Moderator

schlep1967: Thanks for the video. I'd heard of both of these products, but didn't have any real reference for how well they worked. I'll look into these.

Thanks, everybody for the info.


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TexanSon

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Posted: 09/12/23 10:38am Link  |  Quote  |  Print  |  Notify Moderator

I don't think my tank is a straight drop tank, opnspaces. But, no, I haven't seen any build up directly below the toilet.

Oregun

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Posted: 09/12/23 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

You could buy/rent a flexible inspection camera and put in the tank through the flush valve in the toilet with the water turned off and take a look inside the tank to see what you are dealing with. Also look for crud buildup on the sensors in the tank level indicators.

valhalla360

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Posted: 09/12/23 05:25pm Link  |  Quote  |  Print  |  Notify Moderator

Check out YouTube...the ice trick doesn't do anything.

If on a full hookup site try leaving the valve open with a hose running down the toilet for an hour or so....just keep an eye on it in case something large breaks free and clogs the outlet.


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mosseater

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Posted: 09/12/23 05:26pm Link  |  Quote  |  Print  |  Notify Moderator

If there is liquid just below the flush ball looking down into the toilet, at least you know it's full. Do not trust the lights. They are almost universally wrong. Turn the pump off, open the flush valve and see what you can see first.


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rhagfo

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Posted: 09/12/23 05:57pm Link  |  Quote  |  Print  |  Notify Moderator

schlep1967 wrote:

Go watch this video National RV Training academy. I would go with the liquify brand based on his test.
In your situation it may take a few treatments to get it cleaned out.


I was in your situation, but not full time used about 1/2 box of Rid-x added about 10 gallons of warm water and let it sit for a month.
In your case I would use a heavy dose of either of the two products listed. Go as long as you can before dumping, the use a wand to help clear out the residues.


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midnightsadie

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Posted: 09/12/23 05:58pm Link  |  Quote  |  Print  |  Notify Moderator

never trust the sensor there wrong from new not a good way to check your problem. pull the commode and get a good light . might pay to pull the tank and clean.

msmith1.wa

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Posted: 09/12/23 06:59pm Link  |  Quote  |  Print  |  Notify Moderator

Typically there are three sensors on the holding tanks.They are typically spaced at 1/4, 1/2, and 3/4 of the height/depth of the tank. Monitor panels are typically labeled 1/3, 2/3, and full. With this setup when the monitor panel shows full the tank is actually 3/4 full. Or leaving 1/4 of the capacity remaining.


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Bionic Man

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Posted: 09/12/23 07:55pm Link  |  Quote  |  Print  |  Notify Moderator

Echoing the chorus of don’t trust the sensors. They are never accurate.

When I had the pyramid of poo I used rid-x.


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