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Old 07-17-2019, 08:09 AM   #1
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When is black tank full?

When it shoots out the roof vent, lol! I know there's a lot of discussion on this topic out there but I wanted to ask this forum the question. I have a 50 gallon black tank on our 355. This trip, it's just me and my wife. How do I know when it's time to dump the black tank so I don't empty too soon or too late? This size tank with two people, is 7 days realistic? I've heard of the "toilet burp" but not sure what that is. Are there pitfalls to waiting too long to dump? Is it safe to say if you can see the level coming up to the bottom of the toilet it's time to dump? Just trying to find out the best info for this. Thanks!
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Old 07-17-2019, 08:15 AM   #2
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Its hard to say for certain, but my wife and I can survive 7 days on our black tank. Its usually the gray that fills up first. You'll be able to see down the toilet drain when the water is really high and starting to back up into the drain. I'd prefer to dump it BEFORE it comes back up the drain, because I don't have much faith in the seal at the floor line.
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Old 07-17-2019, 08:20 AM   #3
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Its hard to say for certain, but my wife and I can survive 7 days on our black tank. Its usually the gray that fills up first. You'll be able to see down the toilet drain when the water is really high and starting to back up into the drain. I'd prefer to dump it BEFORE it comes back up the drain, because I don't have much faith in the seal at the floor line.
Thanks, that's what I was thinking. As far as the gray tanks go, our Open Range TT could only last 3 days before the overflow started. First time it happened I didn't know what it was but figured it out. Do all gray tanks have overflows? I've come to distrust all sensors now.
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Old 07-17-2019, 08:26 AM   #4
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I usually dump black if it hits 2/3rds on the sensor, just to be safe. That size tank will probably last 2 weeks with 2 people. I have my wife and 4 kids and we've gone 5 days on a 35 gallon black tank.
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Old 07-17-2019, 08:28 AM   #5
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In our rig after 5-6 days, we will see and hear a bubble when the commode is flushed. That indicates to us that dump time is near. I think it gets full enough to cover the roof vent pipe in the tank which causes the indication of burping.
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Old 07-17-2019, 08:56 AM   #6
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Same here, Iíve waited so long it was visibly getting full, but usually if itís burping Iím dumping it.
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Old 07-17-2019, 08:59 AM   #7
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Thanks, that's what I was thinking. As far as the gray tanks go, our Open Range TT could only last 3 days before the overflow started. First time it happened I didn't know what it was but figured it out. Do all gray tanks have overflows? I've come to distrust all sensors now.
Gray tanks should NOT have overflows. It is considered dirty water and you can't dump that on the ground.
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Old 07-17-2019, 09:18 AM   #8
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Gray tanks should NOT have overflows. It is considered dirty water and you can't dump that on the ground.
+1 Gray will usually back up in the shower (lowest drain).

We're usually not out long enough to fill the black tank even enough to dump it. So I always end up having to put a bunch of water in so I can dump the tank.

And that's with 35 gallon tank and 2 adults and a child. I think 7 days is more than realistic (for us) on a 50 gallon tank.

In the rare event that we're in the rig long enough to fill the tank, I will usually dump it when the water gets to about an inch below the outlet as seen from inside the toilet. I have had it "burp" before, but in that case, I was actually TRYING to get it full.
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Old 07-17-2019, 10:12 AM   #9
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When it shoots out the roof vent, lol!.....

Check on the 1st post in this thread. That is a disaster.



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Old 07-17-2019, 12:07 PM   #10
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The most basic way to check if it is full is to shut off the water and shine a flashlight down into the tank. With 7 people, my guess is it will fill quick. I would rather empty early than deal with even one night where I was concerned that the tank would overflow.
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