The purpose of this research was to get the best of microalgae (Chlorella sp.) symbiosis with variation of Agrobost to decreasing pollution level of palm oil mill effluent (POME) according to standard quality. This research used a completely randomized design (CRD) with 5 treatments and 3 replications. The treatments in this addition was microalgae Chlorella sp. as much 800 ml/L (Abundance of c…