Is it safe

Extremely safe to use.  The unit uses a small amount of compressed CO2, an innocuous gas that is used to carbonate drinks, so it is harmless.  The unit delivers the correct level of air pressure that is enough to push the water forward and dislodge blockages.

Should the button be pressed accidentally outside of the toilet bowl, SurePlunge simply emits a cloud of CO2 gas that will cause no damage and will look similar to a “dry ice” cloud on the dance floor!