There are quite a few differences among septic systems. For example, different states have different building codes. These regulations have varied greatly over time, so that older systems may be quite different from newer systems. Also, regulations regarding systems can vary with the age of the system; newer systems typically have to meet much more stringent environmental codes than older systems. I know that our newer system had to be installed with a filter, whereas older systems in our area are not required to retrofit filters. Systems also vary depending on the type of land and soil in a specific area, and on size. A large tank used by a few people is going to react differently than a small tank used by the maximum number of people. Probably the best sources of information are local operators.
Here is a website with general tips about caring for a septic system:
https://www.houselogic.com/organize-...septic-system/
Septic systems also vary in terms of lifespan, depending in part on materials used for the installation, in part on maintenance, and in part on other variables. Older septic systems with concrete tanks can last much longer than newer septic systems with steel tanks. This makes it hard to generalize. Here is a website with information about septic system life expectancy:
https://inspectapedia.com/septic/Septic_System_Life.php