Hiako EPU ka taea ranei e koe te kii he papanga hiako PU kore whakarewa he hiako PU kore whakarewa ranei, he hiako hiako PU pai-taiao kua whakahoutia.Ko te hanganga o te EPU he pumau, me te 7-15 tau te parenga hydrolysis me tenei rauemi hou he pai ki te taiao.