We run our camera through the cleanout in your basement. This is the same access point a plumber would use to free a clog. With this equipment, we are able to locate the tank. We open the front and rear covers to inspect the baffles in the tank . We run the camera through the outgoing line to find the distribution box. We inspect distribution box and field which together with the tank gives us an assessment of the condition of the system.
Here are some before and after photos: