Adoo isku daraya khadadka heerkulka heerkulka kala duwan sida PVC, CPVC, PP, PE, PVDF iyo HDPE oo ay ka kooban tahay balaastiig furuuruc lagu xoojiyay (FRP), Jrain waxay bixisaa xalal loogu talagalay jawiga aadka u kulul iyo jawiga.
Cabbirka: kuma eka xaddiga wasakhooyinka ama burooyinka la heli karo, cabbirrada waxaa loo go'aamin karaa inay ku habboon yihiin shuruudaha codsiga si sax ah.