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Old 10-17-2012, 12:13 AM   #1
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Black water Tank

I have a 2012 SLR 266 toy hauler and have a re-occuring drainage problem. The tank directly under the toilet appears to be very shallow and does not clear debris build up and will not clear with the flush spray from the hose inlet. We have to move the build up out of the way of the opening with a stick. I would like to know the configuration of the tank and how the toilet attaches to it. I have had to bring a water hose into the trailer and use the force of that spray to get the flow moving. This seems to be a poor design. Is there a correction my local dealer can do to correct this problem?
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Old 10-17-2012, 12:22 AM   #2
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I have had what looks like the same issue. My tank is very shallow, and I believe a lot of them are. The other bit of information that I picked up was that toilet paper dissolves in water. I concluded that I would need to add significant amounts of water to the black tank after flushing so there would be always water directly under the toilet even when the trailer wasn't entirely level.
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Old 10-17-2012, 12:33 AM   #3
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Welcome to the forums!

Technical stuff isn't my area of strength so I can't offer much. Not sure how much RV experience you have there are some steps you can take to help prevent problems with the black tanks. Many of us like to add about 5 gallons of water after dumping and will wait to dump until the tank is at least 3/4 or full even if it means adding water to bring the level up.

I'm going to move your thread to the plumbing forum where it should receive more attention. In the event plumbing isn't the right forum one of my mod pals will find it the right home.

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Old 10-17-2012, 01:05 AM   #4
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I'll bet that the pipe from the bottom of the head is too long and won't allow flow out into the tank.
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Old 10-17-2012, 06:27 AM   #5
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Sounds like you need to run a little more water with each flush. Also use a chemical in the tank to help digest solid waste. Make sure you are using TP for RVs. It breaks down more quickly than home stuff. As others have said, make sure tank is fairly full before dumping, even if you have to run additional water in it.
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Old 10-17-2012, 07:06 AM   #6
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When you first head out on a trip are you putting in a couple gallons of water in the tank to start? We always have a healthy portion of water in there before it ever gets used, I also use the geo method. Then depending on how full tank is when we leave to head home I will even add more water to help slosh things around on the drive back.
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Old 10-17-2012, 07:39 AM   #7
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I guess you are getting the drift of how to fix your problem.
Solids are the big issue with black tanks and "the fix" is ALWAYS more water.

My technique is to start out each trip with about 5 gallons of water in the tank and add 1 capful of Calgon "water softener" (not any type of fabric softener or "salt") and 1 capful of laundry detergent (again WITHOUT fabric softener in it),.

This will make the tank walls and floor slippery and the solids should not stick to the bottom or pile up against the valve.

I ALWAYS (no kidding) wait till I have at least the 3/4 light or "F" light on before dumping. This will ensure there is a mass of water to push the solids (that have not broken down) out the drain. Tying to dump without enough water will result in the problem you are seeing.

Note: If I am leaving and only have a partial tank, I will hold the flush lever down until the tank is full and then dump it.
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Old 10-17-2012, 07:45 AM   #8
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If my tank isn't full before dumping I fill it full.
Of course there's NO SOLIDS allowed in my black tank either so that s never an issue.


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Old 10-17-2012, 12:45 PM   #9
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Black water tank

Thank you for all the responses to my issue of a shallow black water tank. A few delemas I seem to deal with are; When we are dry camping for a few days to a week I need all the capacity I can get for use. No restrooms nearby might be an issue when you say no solids in your b/w tank. I the middle of the night I don't want to head for the woods. Bears might but I don't. I even bought a portable tank for over capacity use. I would like to actually see a side view of how the tanks is cofigured, maybe a model #, and maker of the tank where I could look up the actual design drawings on line. The pipe extending into the tank could very well be too long. I am adding dessolvants and some water but not five gallons. Seems like that is defeating the purpose of a holding tank and the capacity cut down by five gallons to start with. Even when we are hooked up to sewer in RV parks this problem still exists. I can see keeping the tanks closed untill full but all we do then is open and dump on the spot. The problem still exists no matter what mode we are in. I can see where soap might help make slick sides and bottom. All good suggestions
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Old 10-17-2012, 12:48 PM   #10
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Quote:
Originally Posted by Earlybird
Thank you for all the responses to my issue of a shallow black water tank. A few delemas I seem to deal with are; When we are dry camping for a few days to a week I need all the capacity I can get for use. No restrooms nearby might be an issue when you say no solids in your b/w tank. I the middle of the night I don't want to head for the woods. Bears might but I don't. I even bought a portable tank for over capacity use. I would like to actually see a side view of how the tanks is cofigured, maybe a model #, and maker of the tank where I could look up the actual design drawings on line. The pipe extending into the tank could very well be too long. I am adding dessolvants and some water but not five gallons. Seems like that is defeating the purpose of a holding tank and the capacity cut down by five gallons to start with. Even when we are hooked up to sewer in RV parks this problem still exists. I can see keeping the tanks closed untill full but all we do then is open and dump on the spot. The problem still exists no matter what mode we are in. I can see where soap might help make slick sides and bottom. All good suggestions
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