All conditions were
compared with measuring value before treatment. Therefore, EM ball
had efficient on treatment wastewater from wastewater plant of
Bangkokthonburi University. The wastewater was treated with set A
had parameter value better than set B and C for all parameters, except
the BOD parameter. The BOD of set B had the value better than set
A and C. However, the results show that EM ball from our laboratory
had value better than commercial EM balls in all parameters.