Ua hoʻokumu ʻia ʻo Donsen i ka makahiki 1996, aia ma NINGBO kahi i kūkulu ʻia ai ke kūlanakauhale awa honua nani a hoʻomohala ʻia. Me ka ʻoi aku o 20 mau makahiki o ka ʻike ma kēia kahua, ʻo mākou kekahi o nā mea hana loea loa i loea i ka hana ʻana i ka paipu plastik no ka hoʻolako wai a me ka ʻōnaehana irrigation.

ʻO kā mākou huahana nui he mau paipu a me nā mea hoʻohui PP-R, nā mea hoʻohui PP, nā paipu a me nā mea hoʻohui C-PVC, nā paipu a me nā mea hoʻohui U-PVC, nā paipu a me nā mea hoʻohui PE, nā paipu hoʻomehana papahele PE-RT, nā ʻōmole plastik a me nā ʻano kiwikā plastik āpau. No nā laʻana: kiwikā PVC, kiwikā PPR, kiwikā C-PVC, kiwikā keleawe.