Membrane filters for microbiological quality control testing must be handled aseptically to ensure they remain sterile and provide accurate test results. Membrane dispensers provide one disc at a time by pealing open a continuous web of individually sealed discs. The Membrane Filter (MF) Technique is a reliable way to test water and wastewater, food and beverages, environmental samples and purified water systems for coliforms, E. coli, Legionella, yeast & mold, Pseudomonas, total bacteria, and other microbial contamination.