Hiki ke hoʻohui ʻia nā kiwi pōpō me ka mea hana pneumatic (pneumatic ball valves) a i ʻole ka mea hana uila (electric ball valves) no ka automation a/a i ʻole no ka hoʻokele mamao.Ma muli o ka noi, ʻoi aku ka maikaʻi o ka hoʻomaʻamaʻa ʻana me kahi mea hana pneumatic vs kahi uila, a i ʻole.