Recognition that Legionella bacteria are transmitted to humans through contaminated water systems is increasing worldwide as the number of outbreaks of Legionnaires disease, a potentially fatal pneumonia, continues to rise. The problem is at its most critical in hospitals due to the large concentration of people with compromised immune systems. To help control the problem in medical settings, Pall Corp., of East Hills, N.Y., introduces for the European market its newest Pall-Aquasafe™ water filter (AQL3).