STP is a bio septic tank equipped with a blower, in the STP process it is very suitable for use in domestic waste treatment that mixes used water and dirty water in processing, besides, this STP is equipped with a blower so that the aeration process becomes more effective, sludge or biomass occurs from the results of the decomposition process will be filtered in the sedimentation medium using a hexagonal type honeycomb made from FRP, then the water from the STP processing process enters the chlorination room, where the water is given chlorine before being discharged into the city channel to be free from bacteria, so the water that is disposed of is water that is environmentally friendly, our STP is more environmentally friendly.