RO membrane’s surface that accumulated biofilm(biofouling) is removed by
disinfectant(biocide). Usually biocide for RO’s biofouling removal uses oxidizing biocide(NaOCl) and
non-oxidizing biocide. At the condition that have a high concentration of biofilms was more removed
by only using the non-oxidizing biocide on the RO membrane surface than using both oxidizing and
non-oxidizing biocide. Also the single use of non-oxidizing biocide enhanced operating time of RO
membrane and that reducing differential pressure’s rising and minimizing the operating cost by the
stop using RO’s Chemicals ; NaOCl and NaHSO