Make Your Own RV Black Tank Cleaning Bombs


Kimberly is the owner of a Tiffin 34PA and the former owner of Starter RV, a 1990 Winnebago Chieftan. She can be found cheering for Georgia Tech, traveling the world, or working on the RV (because there's always something to do on the RV). Don't ever underestimate what she can whip up in the kitchen or accomplish on no sleep. Find out the latest from Kimberly by signing up here.

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14 Responses

  1. Dawn Mork says:

    Tried making these today, and the bombs keep expanding out of the molds. What am I doing wrong. I punch them back down but they have risen out of the mold and onto the countertop every time. I made 3 batches, each time using less water but they have all reacted the same way. Do you know if they will they still work? Thanks

    • Kimberly says:

      Hi Dawn! It really is the amount of water that you used. You really want to use only a couple of drops, just enough to get the dry ingredients to stick.

      The good news is that they still work! They just are not the cute little bath bomb like creations. You can just crumble them up and drop them in the toilet, sink, or shower, like you would if they didn’t expand. When they hit the water, you should still see the fizzing action. I always like to let it sit in the toilet for a minute to clean the toilet. 🙂

      If you still can’t get them to work, just mix up the dry ingredients really well and put them in a shaker. I like the Bounce Scent Booster shaker since it has a measuring cup on top. Then just dump a small amount into the toilet directly. Confession: a lot of times I don’t even make the toilet bombs and just use the dry ingredients!

  2. Barbara says:

    Do you still put the blue enzymes in between draining?

    • Kimberly says:

      Hi Barbara. I have never used the blue enzymes in my tanks. Prior to the Tank Bombs, I used the Geo Method (Calgon water softener and Borax laundry booster) to control the odors and keep things running smooth in my RV tanks. The Tank Bombs replace all the other chemicals and cleaning agents that you would place in the RV black tanks.

  3. BARBARA says:

    If I wanted to just keep as the powder and not turn into “bombs”, how much would I use?

    • Kimberly says:

      Barbara, depending on the size of your tank, probably 1-2 tablespoons. It may take a little experimentation to get it right, just like you probably did with the Geo Method.

  4. GWM says:

    Would it be safe to add some boiling water after flushing the toilet bomb and running few gallons of water. We have noticed some drain flies and are trying to get rid of them. Boiling water seems to help and hopefully getting the tanks clean with this method will solve the problem.

    • Kimberly says:

      It should be ok to add boiling water to the tank. As it cools, the extra water will help keep the sludge from forming the Big Pile of Poo Doom!

  5. Terri A Nixon-Warden says:

    How big are the bombs your using: marble, golf ball, tennis ball?

  6. Shannon says:

    so if you add this after you dump the tanks am I correct that you leave the bomb plus some water in the tank – that it stays until the next time you use the RV?

    • Kimberly says:

      Hi Shannon! Yep, that’s exactly what I do. Dump the tanks. Then add a little freshwater to line the bottom of the tank and drop one of these in. Use the tanks, empty and repeat.

  7. Jennifer says:

    With these bombs is there any need for water softener/Calgon?

    • Kimberly says:

      Jennifer, I typically do not use a water softener. The Borax is a multi-purpose household cleaner that removes hard water deposits. Make sure to add water when you drop them in the black tanks so that the Borax can dissolve.

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