Sistimi ea polante e hloka ho fana ka phepelo e tsitsitseng ea lik'hemik'hale tse hloekileng, metsi a phahameng haholo, le likhase tse hloekileng tsa tšebetso ho pholletsa le FAB.Sena se fana ka litlhokahalo tse phahameng tsa botsitso le botsitso ba sefaele se sebelisoang karolong ka 'ngoe.Hangzhou kinda filter e kholo ea phallo, ntho ea ts'ireletso ea ts'ireletso, filterelemenl e nepahetseng ka ho fetesisa le letoto la lisebelisoa tsa "perfluorinated filter" li fana ka ts'ebeletso e tsitsitseng ea tsamaiso ea feme.