The Hydrophilic Inflator named as CoCo is a hypothetical purification device  meant to be installed in the entrance water body of Barcelona Pavillion . CoCo draws water into its transparent inflators and  pushes the water back into the pool, causing the  impurities to settle down in its opaque inflators .

Design was inspired by the patterns on the wall of the Barcelona pavillion designed by Mies Vander Rohe.