I've been searching their website, but they don't mention anything. How many times can you refill the same cartride with liquid before you should use a new one? Also, they mention not to refill a different flavor on a different cartridge. I have 15 cartridges all of which are different flavors, and half the flavors don't taste that good. I would rather refill those later with good flavors instead of throwing them away.
Just FYI, all the flavors that come in the "smooth" sampler taste like crap.
Just FYI, all the flavors that come in the "smooth" sampler taste like crap.