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From the limited amount I've discussed it with him it's a simple enough process but you need to have a fair bit of room if you want to distill industrial quantities. They do also test the purity in terms of ppm (particles per million). From the sound of it the discovery that this worked was a revolution in the window cleaning industry, especially in C. London.
Airhead
I think the water that condenses in a dehumidifier is technically distilled, although in practice that probably depends on how clean your dehumidifier innards are.