Sorry, you`re right about the algae, that happens with DI water, because the DI process removes the chlorine but not the microorganisms. The distilling should kill anything that`s going to grow, as long as you can keep new stuff from getting in there.
I don`t think there`s any free lunch if you want mineral-free water, RO might be the least maintenance-intensive, but it uses a lot of water, the distilling uses a lot of energy, and the DI is inconvenient, but really the only way to get large quantities of water in a short time.
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