Chovala choluka cha fiberglass chotsika chimatha kupangidwa m'lifupi mwake, thumba lililonse limakhala ndi bamba loyenerera la 100mm, kenako ndikuyika mu thumba la polyethylene, ndikukhotetsa khomo la makatoni.
Zambiri: Patatha masiku 15-20 mutalandira malipiro apamwamba.
Kutumiza: Panyanja kapena mpweya