Jun 29

RV Black Water Tank Problems – RV Black Tank Cleaning Wand

As a full time RVer, we deal with a lot of crap on a year-round basis!  And I am not talking about life situations here.  I am referring to fecal matter.  If you use your RV a lot, RV black water tank problems will arise!  There are easy methods to use to “clear things up”, but simple RV black water tank maintenance using water and an RV black tank cleaning wand will avoid any unexpected issues!

Avoiding RV Black Water Tank Problems

There are a few easy things you can do on a regular basis to keep things flowing and to also keep your tank sensors showing the correct tank levels. These might seem very basic, but I talk to a lot of RVers who do not do these things and problems they have because of it.  So here are just a few ideas.  We will cover the basics first.

  1. Use lots of water when flushing!  I know this is hard to do when you are boon docking, but I fill the bowl with water for each flush of a number two event.  LOL!  For just liquids only, not as much.  You want to be sure you have enough liquids in the tank to dissolve the solids and allow them to completely flush out when emptying the RV black water tank.
  2. Never leave the RV black water tank gate valve open!!  Empty the tank when needed and keep the gate valve closed till it is full again!!  If you are traveling a lot, when the tank is half full add water to fill the tank and then dump.  After all, water is weight and carrying around hundreds of extra pounds of liquids should be avoided on certain classes of RV’s! This is my just my opinion, but it is one that is based on years of RV travel.
  3. Use septic safe toilet paper!  You want to be sure you are using TP that will dissolve easily in water.  You can perform a simple test on your own to see if your choice of TP dissolves completely.  Take a piece of the TP and put it in a glass of water and let it sit.  It should dissolve. If not, don’t use that brand.  Pam and I buy single-ply septic safe TP and that seems to work fine.  If you really need to have super plush soft and scented TP then I might suggest you not throw it in the RV black water tank but into a sealed waste basket.rv black water tank
  4. Only empty the RV black water tank when it is full!  As mentioned earlier, when emptying the tank when it is not full it can lead to problems.  You will not get a good flush out unless you have a lot of liquid in the tank.  While using your RV black water tank, depending on how often you need to dump it, solids will settle to the bottom of the tank.  If it sits there in liquid for a week, the only way to be sure to get the stuff to flow out it is to have a lot of water pushing it out the RV black water tank pipe at the bottom of the tank.rv black water tank
  5. Be careful what chemicals you throw in the RV black water tank!!  I just recently was told a story by an RV full timing friend of mine.  I will share it here to make a point about this one.  She was told that the little dishwasher packets that they sell these days work great in the RV black water tank.  So, she put a few in before hitting the road thinking that as she drove they would help clean and sanitize the tank.  She left the RV for a week while on a trip and returned to it and added one of the normal RV tank treatment packets to the tank thinking that she had forgotten to before the last move.  She went to bed and woke up the next morning in a brain fog and a little disoriented.  The two original packets mixed with the new one and created a chemical reaction that could have killed her had she not left a few windows open.  I mostly use just water because we use our septic system every day.  If I really feel the need I add a few ounces of Rid-X.  This is specifically designed to break down waste in septic tanks.rv black water tank
  6. Use a tank rinser to keep your black tank from developing excessive amounts of residual solids.  As I mentioned earlier, even in the best conditions not all stuff inside the RV black water tank is flushed out. One thing you can do is fill the tank with fresh water and dump the tank again.  That can help to remove the leftover solids.  Some RV manufacturers install tank flushers inside the black water tank.  Using that system after every dump can help to keep the tank clean.  Just don’t use your fresh water hose to attached to it!  I witness an RVer do this the other day – yuk!!  What happens if you get some back flow?
  7. Use a flexible swivel stick to completely clean your RV black water tank. I had not used one of these before until we got our newer RV.  Given it is a motorized RV and it sits lower to the ground, we don’t get the same evacuation flow that we got with the 5th wheel.  We also keep getting tank level readings of 1/3 even after dumping the tank.  So, I purchased a Camco flexible swivel stick to help push the remaining crap out of the tank.  This works great!  It sprays a high-pressure stream of water around the entire tank and gets rid of the leftover solids.  I know it works because when I shine a flashlight down the toilet, into the black tank, and I can see the difference from before and after I use it.  Before use, brown stuff, after use, I can see the bottom of the black tank!  And the tank gauges also reports empty after use.

rv black water tank

Given that most RV black water tanks are not a straight shot from the toilet bowl into the tank, the Camco flexible swivel stick is the best choice to be sure to get the job done right!

rv black water tank

Regardless of the method you use based on the list above, certainly taking into account all seven ideas mentioned above will keep things flowing smoothly out of your RV black water tank. These steps will also help to prevent a situation that would not allow you to use one of the most needed items inside your RV!

Please feel free to share your crappy stories.  This is truly one of the joys of RVing and we must have a laugh or two about the things that do happen!

Happy Crappy Free Travels!!


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  1. henny

    Wow I really enjoyed reading your Posts.Great information.

    1. Howard

      Thank you! We are glad you stopped by! I just flushed mine out again today! It’s a weekly thing when you are enjoying the full time RV lifestyle!

  2. Jon

    Thanks for the great info on black tank problems, I am having a problem now with the black tank electric valve not closing all the way, I replaced the two years ago for the same problem, It has to be a paper jam I think, The valves are very hard to get to as they are up under the fifth wheel under the bottom protective sheet, buried in insulation. another problem was the exit to hook the flex dump hose had only a cap, I installed a hand operated slide valve to stop any surprises, I think I will keep trying to get the valve free, I can hear it trying to close, If I have no luck I will get under the fifth wheel and rip out the 3 inch electric valve and replace it with a cable valve, then always take your advice and do a better job of emptying the tank. I need to be more responsible in that, I will be 80 years old next year and crawling under that monster is getting to be a pain.

    1. Howard

      Hi, Jon!

      I am not a fan of the electric valves: too much to go wrong. The manual type can be enough of a problem to keep operating properly if not maintained.

      Good luck on your project and thanks for stopping by!

  3. Clark Ortiz

    So, here’s my story. Brand new rv’er, new rv, first time blackwater dump. Class c, 3 weeks after I bought it. 2 campgrounds, lots of water, 8 “#2.” 1 roll rv toilet paper. Hook up to dump station, open valve, only redistribution factory winterizing solution. About a cup. Nothing.Close valve retry. Nothing, close and open greywater, woosh! Close it. Tons out, at the factory, when they cut out the hole for sewer connection, they dropped the cutout plate into the tank! Yeah, super hosed!

    1. Howard

      Hi, Clark!

      Thanks for visiting our website!

      Sorry to hear of your issues! The good thing is that you are under the factory warranty and you can take it back to the dealership for repairs. I know that’s not convenient, but at least you have that option.

      Good luck!!

  4. Mary C Allen

    Howard, thank you for the information! We are not using enough water! Only used our campers five times now. After not even one day, meter read black was full? We went to dump after day two and when we opened the cap, black water came rushing out! Gross! We hurried to put on hose. Do you know why this would happen? Camper sat for six months in Arizona for the winter. We are in Idaho now when this happened. Could it be a bad valve? Help! Tank shows still 1/3 full after dump.

    1. Howard

      Hi, Mary!

      Was the gate valve open when you took the sewer cap off? If not then the gate valve may be stuck in the open position. Tank monitors typically give false readings unless the tanks are properly maintained by using the tank flush feature or a swizzle stick.

  5. Glenn McFeeters

    Even an old hand can still learn a thing or two. 7 1/2 years with this RV and years before, I never dealt with the “black mound of death” till now! I have always left the valve open after setting up and rairly worried that we didn’t use a lot of water. We have been on the road for about a month and it caught up to me, opps. I put lots of water along with 10lbs of ice in the tank and am hoping that when we dump that the ice will have scoured the tank and put me on the path to a cleaner way of doing my “business”. Gotta get me a swizzel stick!. Thanks for the idea.

    1. Howard

      Hi, Glenn!

      I am glad you found our website useful in your search for a solution to the “black mound of death.” LOL

      I have seen Youtube videos about the usefulness of ice in the black tank to break up the toilet paper mound. If that does not work you can hire professional services that have the equipment to clean out your tanks.

      Happy travels!!

  6. James Jacks

    I have a Glendale tiatium 5th wheel. I use proper tp and lots of water But I will dump one day and clean wit a wand and the next day after a few flushes the top portion will fill up. Gauges show nothing in the tank but it starts to back up. I get the wand and flush and clears Any solutions to his to solve this problem need help

    1. Howard

      Hi, James!

      Thanks for stopping by our website!

      Is the pipe from the toilet down to the black tank a straight shot or does it take a turn before reaching the tank? DO you have an endoscope that you can use to investigate down into the clogged pipe? You can buy them at Amazon for as little as $30. Link: https://www.amazon.com/gp/product/B00STB0EW6/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=wwwyourfullti-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00STB0EW6&linkId=26fbfe2647b8541cbb9e5037078d9115

  7. Henry Stumpf

    I recently checked holding tank levels. The black tank indicated full so I dumped. The 30Loftk sits on a site full time. After I emptied the indicator still showed full. I went back out and opened the black handle and nothing came out. Tank is empty but gauge still indicates full.

    1. Howard

      Hi, Henry!

      Black and Gray tank sensors will work for a while but eventually give inaccurate readings depending on the sensor type and the tank design.

      The black tank can be maintained if you keep the tank clean with an internal tank flush, the RV black tank cleaning wand, or even filling and emptying the tank with fresh water a few times.

      As I stated in the article, we use the cleaning wand which keeps our black tank reading properly. The gray tank does not as we have no access to it for the cleaning wand. Most commercial tank cleaners have had little affect for us with the tank design we have.

      Try these few methods Henry and see if that helps!

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