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Old 07-06-2016, 06:09 AM   #1
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Black water tank

We've had our Dolphin for a month and are still learning about it. Our black water holding tank fills up and needs to be dropped daily, is this normal?
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Old 07-06-2016, 06:16 AM   #2
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What is the capacity?

How many people in the coach?

How do you know its filling up? Are you basing that on the panel lights/gauge or do you see waste when you look down through the toilet?

If going by the panel lights/gauge they are famous for being way off.

If it is truly filling in a day that means you may have a mound of solid waste in the tank from the previous owner.

Some owners will leave the black vale open, allowing liquid waste to drain and solid waste to be left behind to solidify or they might drain too soon and cause the same issue. Black tank should be drained somewhere between 2/3 to 3/4 full so there is plenty of liquid to move the solids out.

If there is a mound of solid waste you you will need to break it up and flow it out. Try filling the tank through the toilet with several gallons of hot water to break up the mound. Let the hot water soak for 30 minutes or so, repeat.

Follow this link for more reading on black tanks https://www.google.com/#q=black+tank...com&gws_rd=ssl
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Old 07-06-2016, 07:57 AM   #3
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Something doesn't sound right. with a 30 gallon black tank my family of three takes about 3-4 days to fill the tank to about 3/4.

The above post gives a lot of good advice. If this is a used coach it does sound like you need to thoroughly flush the tank with clean water. There are devices available to back fill the tank which makes this easier than filling it from the toilet.

Good luck
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Old 07-06-2016, 08:26 AM   #4
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Quote:
Originally Posted by sdennislee View Post
What is the capacity?

How many people in the coach?

How do you know its filling up? Are you basing that on the panel lights/gauge or do you see waste when you look down through the toilet?

If going by the panel lights/gauge they are famous for being way off.

If it is truly filling in a day that means you may have a mound of solid waste in the tank from the previous owner.

Some owners will leave the black vale open, allowing liquid waste to drain and solid waste to be left behind to solidify or they might drain too soon and cause the same issue. Black tank should be drained somewhere between 2/3 to 3/4 full so there is plenty of liquid to move the solids out.

If there is a mound of solid waste you you will need to break it up and flow it out. Try filling the tank through the toilet with several gallons of hot water to break up the mound. Let the hot water soak for 30 minutes or so, repeat.

Follow this link for more reading on black tanks https://www.google.com/#q=black+tank...com&gws_rd=ssl

Good advice!

One further thought. If it's a solid waste buildup, there is a product called Happy Camper Extreme designed to dissolve that. Look at the link below:

https://www.amazon.com/EXTREME-CLEAN...camper+extreme
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Old 07-06-2016, 12:16 PM   #5
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What's the tanks capacity? You might also have other drains plumbed into the black tank which would add to the problem. After draining the tank leave the valve open and run some water down all the drains, one at a time. If you see any water exiting via the sewer outlet that drain is plumbed into the black tank. It's uncommon but some mfgrs did plumb other bath drains into the black tank rather than the gray. Not much you can do about it if that's the case without extensive modifications. If you have an inspection camera you can use that to check things out inside the tank if necessary.
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Old 07-06-2016, 12:21 PM   #6
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X2 on the Happy Camper Extreme. It does the job.
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Old 07-06-2016, 01:29 PM   #7
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You don't give us much info to work with, but if that is a fairly recent model Dolphin you should have about a 54 gal tank. So you are either going by a totally erroneous gauge, you are using way too much water to flush, or it is the afore mentioned poop pyramid. Follow previous instruction for solving the pyramid problem. Or by using a flashlight for visibility open the toilet flapper and peer into the abyss, you should be able to see what the status is down there.

Glenn
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Old 07-06-2016, 05:30 PM   #8
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Thanks for all of your advice. We have a 1999 Dolphin 5360...36 ft. Today we flushed well and filled it up thru the toilet and dropped in an Oxi Clean pack and will let it sit for a couple of days and flush it again. If that doesn't help We will try the the other ways mentioned above. Also, for most of the time, there are 3 of us using the facilities.
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