A multipurpose plumbing tool has a body at one end, a head at an opposite end and an intermediate neck portion connecting the body and head. The structural membrane morphology is based on a hydrophobic polysulfone membrane backbone and co-grafted thereon hydrophilic poly grafts and anion conducting quaternary ammonium species. Such transfected cells exhibit maximal cell densities that equal or exceed the maximal density achieved by the parent cell lines. One or more dampening chambers may be provided. In another embodiment, an average energy value for processed samples is calculated with individual energy values that are downwardly weighted when such individual energy values are likely representative of noise.