Why would you think that Aqua Mira's contact time would be any less? In fact, Aqua Mira is based on the same chemical as Katadyn; it's just that Katadyn can actually say that it will kill crypto; look at the Aqua Mira literature and see what it says it will kill.

What you experienced with clarity is telling me is that the formula strength of Aqua Mira is not nearly the same as Katadyn, which is another indication of a reason to go with a product that can legally make the claims about killing the nasties we may encounter.

Since as pointed out that you might want to use a stronger mixture with this kind of water, that is testimony to the use of the MIOX since it has testing strips to ensure that the proper levels of chemicals are in the water you are treating.