ʻO ke kāʻei kua inā he laina kumu a i ʻole kahi ʻoihana metropolitan area, paʻa loa nā kumu waiwai o ka lua paipu lalo. Hoʻohālikelike ʻia me nā kaula maʻamau, hiki i ka hoʻohana ʻana i nā uwea liʻiliʻi i puhi ʻia e ka ea 50% o na waiwai iloko o na lua paipu. ʻO ke ʻano maʻamau o ka ʻōnaehana micro-cable i puhi ʻia e ka ea ʻo ka makuahine pipe-micro-pipe-micro-cable. Hiki ke hoʻokomo ʻia ka paipu makuahine i loko o ka lua paipu, a hiki ke hana i ka hana ala ala hou. I loko o ka pahu makua HDPE a i ʻole PVC, a i ʻole e waiho mua i ka paipu makua a me ka micro-tube ma ke ala uwea ʻōpika hou i kūkulu ʻia, hiki ke puhi ia ma ka paipu a puhi paha...
hiki ke puhi ea no microduct
