the disposable polymer - structured filtering kit includes a disposable , polymer - structured filtering funnel with a stem having a distal tip . a flow discharge end is formed at the distal tip . preferably , a polymer fritted filter disc is positioned in the funnel , providing filtering for liquids passing therethrough . the kit preferably also includes a glass vacuum take - off adapter having a port for connecting to a vacuum source for providing negative pressure . the adapter securely and snuggly receives the funnel and maintains position of the distal tip thereof with the flow discharge end below the port , thus preventing contaminants from entering the adapter . a reusable , glass round bottle flask or a disposable vial receives the adapter and the stem of the funnel . the funnel and fritted disc are formed from disposable materials , thus removing the necessity of cleaning them following use . the adapter is reusable , since no contaminants come in contact therewith during filtering .