What is a Urine Diffuser?

The Boondocker’s friend

One of the best ways to take advantage of your urine diverting toilet while boondocking is the use of a urine diffuser. The urine diffuser allows you to “set it and forget it.” The urine diffuser is a simple appliance that continuously buries your urine in a 12″ deep hole that complies with most public land management requirements for disposing of bodily waste. Basically you dig a hole 12″ deep and partially bury the urine diffuser. Connect your holding tank drain line to the urine diffuser using a dedicated, modified section of garden hose and then open the black water holding tank. If there is urine in the tank, open and close it as needed to monitor and control the outflow until it is empty. Once empty, leave the valve open to continuously drain the tank. Since your holding tank is only collecting urine and no solid waste is mixed in, it will flow freely into the ground as intended. This is because you don’t dump it all at once but rather it will drain continuously in small amounts each time you use the toilet.

So what does it take to do that? Here are the instructions for making your own urine diffuser. First, you will need the following items.

  • A 12-inch section of 4-inch diameter PVC plastic thin wall sewer pipe.
  • A 4-inch diameter PVC plastic cap
  • Three inches of 1/2-inch PVC plastic pipe (cut into two 1.5-inch sections)
  • A 1/2-inch PVC elbow
  • A 1/2-inch PVC garden hose connector (female type)
  • A roughly 10-foot section of garden hose with both ends male type
  • An RV holding tank drain adapter with a female garden hose connector

Drill a 7/8″ diameter hole in the center of the top of the PVC cap. Cut a small section (1/8″) off the bottom of the 1/2″ elbow and use it on the underside of the 1/2″ pipe that is inserted into the hole in the top of the PVC cap to help stabilize it. Glue the parts in place using PVC cement. Attach the elbow and the female garden hose adapter as shown below. Paint the diffuser dark green. No point in advertising it. If you haven’t noticed, there is no shortage of “naysayers.”

You install the urine diffuser by digging a 12-inch deep hole near the holding tank drain port.

Ideally, the hole will be located in a clump of brush or at the base of a tree. Use a post hole digger or an auger or an entrenching tool. Fill in around the urine diffuser with earth dug out of the hole. Connect the urine diffuser with the holding tank drain port cap using the double ended garden hose. You may also find it possible to use the urine diffuser to discard your grey water if the soil is absorbent enough. If you plan on doing this, you might want to add some kind of flow restricter to the line. A simple barbed ball valve should work. In areas where the soil is simply too rocky and won’t absorb the urine, the diffuser should be discontinued and the urine should be stored in the holding tank.

To remove the urine diffuser, first flush it with gray water. Control the flow so that you don’t flood the diffuser. After flushing it, pull it out of the ground and fill in the hole with earth. Make a mound if you want to remember where it was. You will find that this accessory is a real problem solver. And remember that it can only be used with the C-Head toilet at this time. No other urine diverting toilet offers direct “toilet to holding tank” diversion. If after using this system you find tips for other readers please comment.

All this being said, I don’t want to encourage or condone breaking the law. The Bureau of Land Management sums it up pretty well.


Because laws vary from place to place, always check with local land management agencies to determine what the specific requirements are for the area you plan to visit. With a little forethought and preparation, you can do your part in helping to keep your favorite outdoor places clean, healthy, and ready for future generations. Thank you!

Bureau of Land Management

Here is a good article (click here)on the “Leave No Trace” website from the Center for Outdoor Ethics”.

Please feel free to make constructive comments or ask questions.

Copyright 2019 – C-Head LLC – All rights reserved on all content.

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