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We bought a house a year ago with a septic system (a simple gravity system). The sale contract required an inspection and pump out. Might be required by state YMMV. I also called the county for the installation permit. Very good to have as it shows where the tanks are and where the drain field is. The county will also do inspections. Best you call the permitting agency of your area and get the records.
My folks house has a motorized system due to the size of the yard. The tank has a motor that churns it up 24/7 and a small drain field about 10 feet away. We have a maintenance contract on the system that includes yearly inspection and pump out. Over the years we've had to replace the pump twice, once undressed warranty.
I also thought some of your guys who go 10-20 years without pumping it out are nuts. Where do you think 10-20 years of solids/slug goes?
We never use any bacteria additive. We just didn't introduce grease, chemicals or acids. No trash just poop and TP.
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