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Old 08-18-2018, 09:53 AM   #1
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Sani problem

Bit of a story here, we have bought a 2010 serrano Thor motor home. Very little miles 17thousand. Found out some history people used it to live in while caretaking a campground. First trip out black tank filled really fast, we figured maybe dealer had not emptied before we got it. Second trip same thing, we have now figured out they must have been hooked to sewer and kept the valve open so we have stuff built up in tank. Am wondering if anyone has any home remidies for putting stuff in tank to help break down crap? I have been flushing it out with hose attached wand cleaner from top and think I am making some headway. Just checking to see if anyone has any other ideas.
Thanks
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Old 08-18-2018, 10:11 AM   #2
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The best thing is to fill it at least 1/2 full of water with a little Dawn dish soap and let it soak for a couple of weeks. Your'e going to have to soften the poo pyramid before you can wash it out. You may have to rinse-repeat several times to get it all.

Here's another thread about a similar problem:
Black Tank Sludge Treatment ???
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Old 08-18-2018, 11:03 AM   #3
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Quote:
Originally Posted by Lt Dan View Post
The best thing is to fill it at least 1/2 full of water with a little Dawn dish soap and let it soak for a couple of weeks. Your'e going to have to soften the poo pyramid before you can wash it out. You may have to rinse-repeat several times to get it all.

Here's another thread about a similar problem:
Black Tank Sludge Treatment ???
X 2 Does the rig have a tank flush on the black tank? Leaving that on with the valve open will eventually get some of it out after the Dawn attack.

A wand that can be stuck into the tank from the toilet or from the valve in the wet bay might be of some use also, the kind that takes a hose on one end and creates a penetrating spray
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Old 08-18-2018, 11:28 AM   #4
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You could try "Commando Black Holding Tank Cleaner".
https://www.amazon.com/gp/product/B0177AJ64G
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Old 08-18-2018, 11:24 PM   #5
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Welcome to the forum!

Here is a link to about 250 threads that have previously dealt with your issue.

The first thread in the list is a presently active one.


https://www.google.com/search?q=%22b...=14&gws_rd=ssl
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Old 08-18-2018, 11:55 PM   #6
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Add a cup or so of Calgon liquid with your Dawn soap, and let it mellow for a few days, hitting it with the wand every day or so...then ..after a few days try to dump the tank combined with the pressure wand..
good luck.
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Old 08-19-2018, 01:54 AM   #7
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Everything said so far is great and right on point. Next trip after you break camp make sure to add that water/bath salts/dawn mixture and dump the Ice tray into the crapper also. If you don't have an ice tray then get a 5 lb bag of ice and dump it in there. The ice will help beat up the crap while traveling then dump it upon next camp ground or end of trip.
The only other thing would be the dreaded high pressure back flush or top down flush if the toilet sits right on top of the tank. But you need a pressure washer and have to be hooked up to water and sewer for this. The back flush is the nasty one so be prepared to get crappy

OK just fill it and soak it, fill rinse repeat. It may take a couple of weeks, but keep water in it.
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Old 08-19-2018, 02:47 AM   #8
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Use a regular whole bottle of Dawn dish soap mixed with water in the bowl of the toilet so it's dissolved in the water before you flush it down.

Then fill the black tank completely full and let it sit for a couple days.

I use a cup mixed that way after every trip in both my black tanks and haven't had a problem for the past 13 years.

I also use that solution to scrub the seals with a three inch toilet brush in both my toilets and then keep water in the bowl while stored so they don't dry out.

I haven't had a problem with the seals in the toilets for 13 years using that technique.
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