The required depth varies a bit from model to model, but, on average, the water only needs to be about 18" (0.45m) deep when using standard fins. A shorter stroke can be used in stretches of shallower water. See the video above for an example of this technique.
Not much. We recommend a quick rinse with fresh water when you're done for the day and an occasional spray with silicone lubricant.
Yes. The Click and Go mounting system allows you to quickly remove the MirageDrive for cleaning or storage.