The family of the TPP vacuum filtration rapid-Filtermax stands out not just because of its quadratic form, but also its excellent product features. Large quadratic filter surface of 49 cm2 and 69 cm2 respectively is 20 % larger than with competitors brands in the market made up of ircular membranes Premium PES filter membrane, pore size of 0.22 m High flow rate Low protein binding, excellent chemical resistance Secure footprint: flask with its sturdy square footprint is difficult to tip over during filtering and therefore eliminates the risk of encompassment of the filter unit by the vacuum tubing Quadratic form stores more efficiently media with less wasted space than circular bottles Additional userfriendly advantages: Tapered form at the neck enables large and small hands a firm and slip free grip of the rapid-Filtermax system even when wearing rubber gloves One separate packed screw cap and adapter for the vacuum connection hose with inside diameter of 6 10 mm (2.36 3.94 inch) is supplied with each system Full buyer's flexibility: choice of filter set, top only or flask only, all provided with a GL-45 screw thread