The Complete Guide To Treating Your RV Toilet

August 29, 2018

The Complete Guide - Treating Your RV Toilet layered over a journal and two pens

Updated November 2019

Treating your black tank correctly is simple. When you use RV Digest-It, you ensure that your system remains clog and odor-free. There is a lot of misinformation out there regarding the best ways to treat your tank, so we’ve developed this easy-to-follow, step-by-step guide so you can effectively treat your black tank without worry.

Follow These Guidelines to Effectively Treat Your RV Toilet:

  • Dump your black tank.
  • Back-flush your black tank. If your RV is equipped with a back-flush system, run the back-flush until only clear, fresh water is coming out of your discharge hose. For some people, this can take 30 minutes (or more) depending on your RV’s system, the dump station fitting, and how level your RV is. Don’t be fooled! You may start to see clear water coming out of the tank and assume your tank is clean. However, keep flushing for another few minutes. Often, a second wave of waste that has collected in the corners of the tank will flush out after a few more minutes. If your RV isn’t equipped with a back-flush system, run fresh water (or gray tank water) through the tank following your tank dump in order to flush out the residual waste in the discharge hose.
  • Close your black tank valve.
  • Add several inches of water to your toilet bowl.
  • Shake RV Digest-It thoroughly before each use. Bacteria settles over time and needs to be mixed up before each treatment so that the correct amount is used per treatment.
  • Pour 2 ounces of RV Digest-It into your toilet (4 ounces for the initial treatment).
  • Flush your toilet.
  • Add several inches of water to your toilet bowl. You’re done!
  • Repeat each time you dump your tank. To ensure your waste is being properly digested and odors are controlled, treat your black tank after each dump. After the initial treatment, you will only need to use 2 ounces of RV Digest-It per treatment.

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Follow These Guidelines to Effectively Remove Odors and Clogs:

  • Back-flush your tank for 20 to 30 minutes every 3 to 5 dumps. This will help to maintain working sensor probes and ensure that no residual waste begins to collected in the corners of the tank, which can lead to clogs or odors.
  • Always keep your black tank valve closed except when dumping your tank.
  • Always keep several inches of water in your toilet bowl when the RV is stationary. This will ensure that the odious gases in your tank do not back up into your RV.
  • Always flush your toilet with an ample amount of water. Doing so ensures that the microbes that keep your tank odor free are well-hydrated and that tank temperatures stay below 85 degrees. We recommend holding down your flush pedal for 10 seconds each time you flush your toilet.
  • Keep your tank temperatures low. If your tank gets too hot, the bacteria will begin working less efficiently. We recommend adding water or ice if you believe tank temperatures are exceeding 85 degrees.
  • To keep odors diminished, we recommend dumping your holding tanks every 4-5 days.
  • Never clean your RV toilet bowl with chemical toilet cleaners. These products will kill the good bacteria that keep your black tank clog and odor free. Use a bacteria-infused toilet bowl cleaner like Unique Toilet Cleaner.
  • After every dump, treat your tank with a bacteria-based tank treatment like RV Digest-It. This will ensure that your tank remains clog and odor free.

Download This Guide Here


This guide is a single part of our recommended maintenance we call The Unique Method. It is a time tested treatment technique that will help you get your holding tanks on track. Break down waste, eliminate odors, and Enjoy your RV! Learn more about The Unique Method here.





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