Have they looked at UV light?  That was introduced quite a while ago as a fast, cheap, and portable method of detecting bacterial contamination in many things, including foods.  The industrial-grade purifying systems are also worth looking at if sufficient power is available.

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Have they looked at UV light?  That was introduced quite a while ago as a fast, cheap, and portable method of detecting bacterial contamination in many things, including foods.  The industrial-grade purifying systems are also worth looking at if sufficient power is available.