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The greatest benefit of installing a composting toilet is not having to deal with a black tank; but what do you do with that unused tank that’s taking up valuable space in the RV? We thought about adding another freshwater tank, or removing the black tank and adding a larger grey water tank, or even adding a PVC pipe with a shut-off valve between the black and grey to combine the tanks; but the idea of me (Jason) removing or replacing anything of this magnitude in the RV sounds like a horrible idea.  So I gave up…until we were having dinner one night with our friends the RV Geeks and they recommended the most ridiculously simple, zero install idea of how we could combine the RV black and grey tanks.

Before attempting to combine your black and grey RV waste tanks It is important to understand the capacity of your specific RV tanks.