Microdyn-Nadir’sR-Aquadyn is a compact rack solution based on the double asymmetric, hydrophilic low fouling PAN hollow fiber membrane modules type UA1060. Its simple construction allows for the easy integration and installation of a set of pre-assembled modules into water treatment plants and is the perfect choice for large-scale projects. One rack unit comprises a set of 24 pieces of Aquadyn modules with a total membrane area of 1440 m2/15,500 ft2. These rack units can be manifolded to a bigger rack of either 48 or 96 pieces. The double-asymmetric structure of the hollow fibers effectively rejects bacteria and solids due to a filtration layer inside and outside the hollow fiber displaying a significant advantage over single asymmetric hollow fibers.