Forum Discussion

TRUENORTH60's avatar
TRUENORTH60
Explorer
Sep 18, 2016

THE HORROR . .. .. . THE HORROR. ... . . THE HORROR

So, the level indicator for my black tank seems to have two indications; 3/4 full or full. Even if I drain the tank, the monitor still shows 3/4 full. I can look straight down the toilet and see that the bottom of the tank is not covered with . . .. .. ahem . .. . . 'water'. No matter how much of the afore mentioned water that is added changes the reading until suddenly, and cruelly, the 'full' light on the monitor comes on and I am faced with the dilemma; 'to flush or not to flush. That is the question."

You can imagine my delight.

It would appear to a logical mind that the sensors in the black tank are corrupted ( and who could blame them). I have tried several remedies including dumping a number of bags of ice cubes down the drain and driving around, various cleansers and a load of Mr. Clean who claims to be able to 'clean everything in your house in just a minute!'

Does anyone out there have any suggestions about a product that will do the job or a method I can try that will not require me to actually entre the tank?

Thanks in advance.

27 Replies

  • Good ideas above...but also Google the "Geo Method" and do that as well.
  • The tank sensors sense "residue" on tank wall and guess what you have on your black water tank?
    In my 30 years of RV-ing I never used tank flushing. What for? I just made a habit to fill up lot of water before I make #2 and having 3 sons helped in having lot of liquid there.
    Even with 5 gallons black tank in ClassC took us well over a week to fill up black tank. Grey tank is another story.
  • Same thing happens in my RV. At different times, I use the cleaning wand, backflush, various cleaning liquids in the tank, drive around with tank partially full to shake things around, etc. Sometimes I can get the indicator lights to be accurate....for a few days. Then it's back to showing 3/4 full when I just emptied it!

    Just get used to how many days you can last before the tank gets full. Sounds like you have a straight visual shot down the toilet. Me too. So I just look down there to check.

    I like what Old-Biscuit wrote. Don't let worrying about your tank indicator lights disrupt your camping fun.
  • I agree with Mike-s. However, I've found that one needs to use it a little more often than every now and then. Also attention must be paid to spraying toward the area where the sensors are located of obvious reasons. Been doing this for years and years with good luck. The latest thing I've been doing is to put an enzyme sewer line cleaner into the black tank after the wand treatment. It seems to provide a final cleaning.
  • I don't pay attention to those level indicators.

    RVng is about having fun......worrying about waste tanks etc does not play into my fun time

    When toilet 'burps'------time to dump
    When sink/shower starts draining slower ----time to dump
    When water pump goes 'burrruuuuup' ----should have added more water
  • Meh, learn to live with it. You'll get adjusted to how long you can go before it fills up completely. They're notorious for that. BTW, welcome to the forum!

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,288 PostsLatest Activity: Jan 09, 2022