High Performance Fine Bubble Membrane Diffuser For Waste Water Treatment Aeration - POLYFLEX â„¢ & POLYPOR â„¢. UNIQUE DESIGN BLINEX's POLYFLEX â„¢ & POLYPOR â„¢ unique open-end tube design diffuser allows water to completely fill the diffuser support tube, thus eliminating diffuser buoyancy and not allow Diffuser to bounce during operation and there is not breakage failure of nipple end connection.