Sago liquid waste contain fair organic materials and the addition of EM4 may increase those materials. To understand the best concentration of fermented waste for growing Chlorella sp, a study has been conducted from April to August 2017. There were 4 treatments applied, the fermented waste was mixed with peat water, P0 (0%), P1 (37.5%), P2 (50%), P3 (62.5%) and P4 (75%). Chlorella sp was c…