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Old 01-05-2016, 01:33 PM   #11
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Are you using the black tank flush?

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Old 01-05-2016, 06:59 PM   #12
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Originally Posted by oldmanAZ View Post
x2 all of the things said previously regarding the black tank:
- I have a clear connector
- use the built-in black tank flush
- flush until the water runs clear
- add water into to black tank after flushing.
(BTW, adding water is important to not build a 'tower of poo' at the bottom of the tank.)

I must have debris stuck on a sensor because it always shows 1/3 full even when it is totally empty. I never used any chemicals (never had an odor problem), but next season I will use chemicals (before the 'wand') to see if I can get that sensor clean.
I've given up on tank sensors. I just wing it. Have a pretty good idea of how long we can go without worrying.

I always heard that a combination of Calgon powder (like 1 cup) and 1 cup of laundry detergent and about 10 to 15 gallons of water in a tank to clean it. Never used it on my gray tanks, but did it all the time on my black tank. Would always release stuff that the black tank sprayer missed. I used chemicals in my tank only once: to get rid of the bottle they have me at delivery.

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Old 01-05-2016, 09:47 PM   #13
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As the owner of 3 different MHs over the years my observation is that the issues with gray and black tanks crossover to all types of RVs. Like anyone who has had tanks for years, I also have had my share of issues ranging from odors to inoperable level sensors. After considerable research and some trial and error I have a system that works well for me.

After a trip where I likely won't be back on the road for several weeks I empty and use the installed black tank flush until it runs clear. Then I close valves and add a solution of Savogran TSP powdered cleaner, liquid Calgon water softener, and warm water to the tanks. More solution obviously into the black tank. Then I go for about a half-hour to 45 minute drive on my good Ohio back roads taking many turns and making many starts and stops. Then I dump and flush again and I am amazed every time on what else comes out of both tanks! It must be grease and soap scum in the gray tank and make your own guess about the black tank. Never had any more problems with the level sensors or any storage odors.

TSP available at your local big box home improvement store and the Calgon is at Walmart in the laundry aisle.
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Old 01-06-2016, 06:26 PM   #14
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you can get a clear drain hose attachment and you can get if your done draining.

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Old 01-06-2016, 06:53 PM   #15
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When my sensors start to act up. After dumping, I add 5 plus gallons of water and a cup of liquid fabric softener to each tank. Drive home with it sloshing, and then drive to the next CG. Typically after two trips doing this my sensors read good again. My htt tanks are small, so you might need 10 to 15 gallons in you rig.

Both do the same thing, just differently. Water softener is probably cheaper.

One more thing alway keep a few gallons of water in each tank, this will help keep debris from drying on the sensors, and keeps the from being stinky.
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Old 01-07-2016, 09:20 AM   #16
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Originally Posted by RobinA View Post
Thanks for all the info everyone!!
Take a look at this. I'm going to do this 3-4 times a year. The GEO Method.

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Old 01-07-2016, 06:48 PM   #17
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Originally Posted by TCNASHVILLE View Post
Take a look at this. I'm going to do this 3-4 times a year. The GEO Method.

Good info, Thx
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Old 01-07-2016, 09:28 PM   #18
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Geo Method for us too, kind of. I make my own home brews. It's a turd tank, so not much will hurt it, as long as you're careful with chemicals and make sure nothing will hurt the valve seals. Lots of things will work. If you ever continue to have sensor problems, try Unique RV Digestit. You can use it for a regular tank chemical, but more importantly, you can use it to clean EVERYTHING out of the tank. It has directions for both. I haven't had to use it as the cleaner on mine, but have on other peoples rigs, and several years worth of stuff came out. The stuff works. Put the bottle of stuff in, fill tank up past the full sensor, wait however long it says (can't remember), then dump and flush. As a regular chemical, the way you use it will go against most stuff you have ever learned, but rest assured that works to. It has to have "stuff" to work, since it feeds off of it.

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