A septic system works best when it receives household wastewater, instead of trash, excess grease, or harsh waste streams.
Keep solids under control
Avoid using the toilet as a trash can. Reduce garbage-disposal loading where practical because added solids can increase pumping needs.
Be careful with chemicals
Solvents, oils, paint, pesticides, and other inappropriate chemicals can interfere with treatment and threaten groundwater. Use local hazardous-waste programs where applicable.
Useful next reads: maintenance guide · warning signs · septic additives evidence