have been on septic tanks all my life. the only time i ever needed to pump was if the leach field wasn't working right. had the old orange bird pipe collapse once years ago and had to repair replace some of the leach field with the new penetrate r type. i crushed the leach field once by driving a tractor over it also. put some copper sulfate crystals in yer turlet and flush once or twice a year to keep roots out. and there is some bacteria you can buy and flush also if you use alot of clorox that kills the life.