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Old 06-20-2018, 10:55 AM   #1
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Black water issues

We are new to the Full-Time RV life and I have a question about Black Water issues. Currently, our black water tank is stuck at 33% no matter what we do.
We have used the water sprayer inside to wash out the tank, used an additive to help break down waste, etc. We only use the recommended toilet paper etc. Any help would greatly be appreciated. Are we missing any steps, etc.

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Old 06-20-2018, 11:00 AM   #2
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Our 38FB2 has the same issues. We will be moving to a new location in a couple of weeks, have read that sometimes this helps with stuck sensors. After dumping our tanks completely they still read 33% on both black tanks and the shower gray tank. The kitchen gray tank will go back to zero. No solids have been deposited in our black tanks, only liquids so far.

Pete
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Old 06-20-2018, 11:00 AM   #3
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Originally Posted by jdmoody09 View Post
We are new to the Full-Time RV life and I have a question about Black Water issues. Currently, our black water tank is stuck at 33% no matter what we do.
We have used the water sprayer inside to wash out the tank, used an additive to help break down waste, etc. We only use the recommended toilet paper etc. Any help would greatly be appreciated. Are we missing any steps, etc.

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If your talking about 33% on the gauge forget about it. They seldom work correctly. Have new sensors added to the outside of your tank. If you have a straight shot down from the toilet to the tank, use a stick to measure. Think dipstick on your car.
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Old 06-20-2018, 11:03 AM   #4
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Just prior to driving add 20# of ice in the toilet and add a few curves. Calgon water softener, borax and dawn dish soap help but you need to drive a lot with tank filled with about 1/3 water.

Jack
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Old 06-20-2018, 11:07 AM   #5
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Thanks everyone. I will let my hubby know. Appreciate all the tips and info.
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Old 06-20-2018, 11:09 AM   #6
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It's probably a tank sensor issue and cleaning those sensors is difficult. You've done what you can... so don't worry about it. Most of us have learned to live with some problems with the sensors.
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Old 06-20-2018, 11:15 AM   #7
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Just prior to driving add 20# of ice in the toilet and add a few curves. Calgon water softener, borax and dawn dish soap help but you need to drive a lot with tank filled with about 1/3 water.

Jack
How much Calgon do you use top treat the black water tank ? I think my tank is 37 gallons.
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Old 06-20-2018, 11:32 AM   #8
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Try backflush valve
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Old 06-20-2018, 11:59 AM   #9
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How much Calgon do you use top treat the black water tank ? I think my tank is 37 gallons.
There are posts and u-tubes that debunk the ice idea. So I don't bother.

I use the liquid Calgon and Dawn. I use the cap on the Calgon bottle and put 1 cap full of each every time I dump the tank. Also add a gallon or 3 of water to the empty tank. I've gone back and forth a few times of having a sensor not read properly then get cleaned off.

I've looked at the See View monitor system mentioned above that mounts the sensors on the outside of the tank. But at $300-$500 plus the effort or cost needed to install, I've decided to live with what I have.
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Old 06-20-2018, 12:02 PM   #10
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The sensors are notoriously inaccurate.

Unless you believe your tank isn't fully draining and leaving 1/3 in it, I wouldn't be to concerned with the gauge.

Do you use a clear elbow or extension at the sewer port on the side of your rig?
If so, you'll know whether it is draining.
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