Optimized for Minimal Background in Dissolved Metals Analysis of Water samples-Easiest and most efficient way to meet filtration requirements of the U.S. EPA for 0.45 µm filtration.-Self-contained, disposable units eliminate the time and hazards associated with cleaning filter holders.-AquaPrep 600 capsule has over four times higher EFA than 142 mm disc filters, reducing the need for multiple filter changes during the sampling process and ensuring rapid sample filtration. -AquaPrep 600 capsules have Metals Ananlysis Certification on 48 metals printed on each package. This product is not approved for use in medical, clinical, surgical or other patient applications.