Pall Life Sciences Glass Fiber Membrane Filters Type A/E Membrane Filters meet the requirements for suspended solids testing, as described in Standard Methods for the Examination of Water and Wastewater, current edition. They are made for testing dissolved and suspended solids in wastewater and gravimetric analysis of air pollutants, and have high flow rates, wet strength, and dirt (solids) holding capacities. They reduce filtration costs and premature clogging when filtering difficult-to-filter or highly contaminated solutions.