ABSTRACT Tofu liquid waste is rich in TSS and COD so it needs to be treated before being discharged into the environment. This study aims to reduce TSS and COD in tofu wastewater using biofilter added to EM4, which was conducted in May-July 2019. The design of this experiment uses 3 kontrols, 3 treatments and 3 replications with consisting of the addition of 17 ml, 20 ml and 23 ml EM4. The…