Open covers carefully, check inlet and outlet baffles and tees, file cracks or rust

https://ace-wiki.win/index.php/Budget-Friendly_Septic_Tank_Cleaning:_Professional_Tips_and_Resident_Solutions

Open covers carefully, check inlet and outlet baffles and tees, file cracks or deterioration, and repair seals to stop groundwater intrusion and exfiltration that can overload the drainfield.