Water-related illnesses affect nearly 40% of the travelling population.  Medicines can treat only the symptoms, and these medicines often are difficult to obtain in foreign countries - prevention is always the best cure. By combining microfiltration, broad spectrum adsorption, molecular sieving and other natural separation mechanisms, First Need systems produce safe, clean, healthy water without adding iodine or other pesticides.

No other system, regardless of price, can match First Need purifiers' combination of all-round effectiveness, reliability, size, weight and operating safety.

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Notes:
? = Inconsistent, capacity effectiveness unknown.
- = Effectiveness varies - see manufacturer's instructions 

General Ecology's First Need water purifiers have passed rigorous verification and field testing by research institutions, health and safety associations, independent laboratories, expeditions and individual users worldwide.