If your system has an effluent filter, it will need checking and servicing approximately every 2 to 3 years. While this could be done by a homeowner, it is a messy, unpleasant task and there are potential safety issues because of the germs in the sewage and toxic gases. For most people, it would be appropriate to hire a company that specializes in septic system maintenance and service to inspect and clean the effluent filter.