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Kontes Brand Filtration Assemblies with Fritted Glass Supports are designed as membrane filter supports for vacuum filtration analysis of liquids from particulate or biological contamination. Required accessories are a side arm filtration flask or filtration manifold, a vacuum source and ¼" ID vacuum tubing. These assemblies are not recommended for producing ultra-clean filtrates since the fritted glass of the filter support base is difficult to clean thoroughly and may contribute contaminates from previous filtrations.