I like the concept but I am not sure how well they will work in the field.
One of the big issue with anykind of development or relief effort is that it isn't self sustaining. This type of solution requires a continuous supply of these devices to be given to people.
The second bigger issue with this device is the plastic tray. If the tray breaks the filter becomes limited in value. Non-Replacable parts can make these concepts fail.
Before helping fund something like this I would love to here from some development groups not assoicated with it to see how they see it would work in the field. There are tons of good intentioned development projects which end up failing because they don't address issues on the ground.
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