Hydraulic aunoa ruma kōpeketanga perehi tātari he pūnaha kōpeketanga ngā o te perehi tātari, rango hinu, papu hinu waipēhi me te rūnanga whakahaere, e taea te mohio te mahi o te tiaki pēhanga me te pēhanga replenishment o te pūnaha waipēhi ki te whakarite i te mahi o te filtration wai.Ko te keke tātari pehanga teitei he iti ake te ihirangi wai, a ka taea te whakamahi mo te wehenga totoka-wai o nga momo whakatārewatanga, he pai te awenga wehenga me te whakamahi watea.