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Old 10-02-2011, 05:49 PM   #1
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newmar black water tank

I have had a problem with draining our black water tank. It seem that there is something like a 1/4 to 3/8 inch cement liner in the tank that is breaking loose and stopping the the tank from draining. Has any body heard of this problem?


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Old 10-02-2011, 09:08 PM   #2
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Weird problem, my guess would be someone has put something in the tank. To try and stop a leak mayby? You have posted this in the Thor Industries section, you may get more responses if you put it in the Newmar section. Good luck.

2004 Newmar KSDP 3353
Surrey B.C.
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Old 10-02-2011, 09:23 PM   #3
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I'm thinking 'built up crud'.. How long have you owned the coach? You might have someone inside with a hose, and someone outside with a rubber mallet banging (gently) on the tank...

I've got a flexible wand for my pressure washer (cleans gutters) to spray into the tank via the toilet.. Flakes of what looked like Frosted Flakes came out.. ALOT of it...
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Old 10-02-2011, 09:37 PM   #4
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Welcome to the forum! I have moved your thread from the Thor forum to the Newmar forum where you should get more views.

I'd bet on built up crud too. If you don't use your coach full time consider dumping the tank as best you can before storing it then fill it with clean water an an enzyme cleaner like Roebic® Septic Tank And Cesspool Cleaner (ROEBIC K-57-4 ) - 4 Pack - Bacterial Drain Cleaners - Ace Hardware

It'll have to sit for a while to be effective but when you take it back out dump again and then use one of the wands that attach to a hose and you stick down the toilet like Midniteoyl mentioned. It might take a few cycles but I'll bet it helps.

Good luck

Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

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Old 10-02-2011, 09:46 PM   #5
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Both our DSDP's have had tank clean out sprayers built in. As was said earlier: I'd put in some enzyme cleaner and let it sit for a few weeks and maybe drive it over some rough roads each week to shake it up, then dump it.
Some people even dump ice cubes down the toilet and drive for a while.
I've been RV'ing since 1957 (before most rigs had holding tanks). In all those years and multiple rigs I've never had a buildup. I do wait till the tank is ¾ full before dumping or add water to fill to that level and I ALWAYS use chemicals. This weekend just the wife and I were out, tanks are only ¼ full and we're headed out again on the 21st so I didn't bother dumping them at all.
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Old 10-03-2011, 03:18 AM   #6
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Welcome to the forum rolboo and irv2.
All the above posts are correct you should also leave your black tank valve closed until tank indicator says its time to dump.
There are baffles in tank that of same material as tank that should not break down.
You need to post in profile or signature your coach information it will help in answering your questions.
Enjoy the forums.
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Old 10-03-2011, 04:56 AM   #7
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Glad you joined us but sorry to hear of your problem. Let's see if we can help as well. Plenty of good suggestions so far. Go to youtube.com and when the site comes up type in rv geeks in the search box at the top of the page. When the next page comes up just go down until you find How To: Dump & Clean an RV Black Tank. It's about a 14 minute clip but quite informative. The same fella has quite a few tips on rv's you may just want to save the entire thing to your favorites.
Hope this may help a bit. Be safe and Happy Motoring!!!
Steve & Sally / Hudson Our Little Pom / Heidi, Houston & HiTee Forever in our Hearts
04 NEWMAR MACA 3778 W22 / 05 PT Vert
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Old 10-03-2011, 05:29 AM   #8
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This suggestion might be insane, but I would go to a "do it yourself" car wash - snake the wand through the bathroom window and into the toilet's the open valve - turn that sucker on and blow whatever is in the tank into the next county!!!
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Old 10-03-2011, 06:52 AM   #9
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We have a 2005 KSCA 3778 and have trouble dumping unless I lift the front. When the coach is level it doesn't dump well. We had had 4 Newmar moho's and this is the only one we have had trouble with.

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newmar, tank, water

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