I tata nei, kua whakawhanakehia e matou he riipene angiangi angiangi-rua mo nga kaihoko Hapanihi, kei te huri haere te wai whakamatao, te pāmahana + 5 ℃.

I te tuatahi i whakamahia e te kaihoko te riipene rerehua unidirectional, engari he maha nga tuunga e tino hiahia ana ki te reera rererererangi takirua, no reira ka tono to taatau kaihoko ki te tuku ano i te riipene angiangi angiangi ki enei tuunga me te kore e huri i te ahua o te kanohi ki te anga.

Whai muri i nga korero a te tari hangarau a THT, i whakatau matou ki te whakamahi i te hangahanga hiri hiri tuatahi ki te tukatuka i te takirere rerererere hiri-a-rua.Ko te mutunga mai, i angitu matou, PN25 te pehanga pai ki muri 1:1.