Sistimi ea phepelo ea metsi a mollo oa Purity PVK e kopanya bonolo, ts'ebetso, le ts'ebetso ea litšenyehelo tse nang le likarolo tse tsoetseng pele joalo ka phepelo ea motlakase habeli. Likhetho tsa eona tse feto-fetohang tsa pompo le tanka ea khatello ea diaphragm e tšoarellang nako e telele li etsa hore e be khetho e nepahetseng bakeng sa ho netefatsa phepelo ea metsi a mollo e tšepahalang le e sebetsang maemong a fapaneng.