I have three houses and my shop on septics, have only had the shop pumped once because we were having a problem with office drain. it hadn't been pumped for 35 years. They said nothing wrong with it. Dug up the around the tank added clean outs for the pipe and recovered it. a tree 150' away had a root get inside the drain pipe at a improper glue joint and collapsed it. Never flush the ladies stuff down, other than that if it's sized right never will have a problem. All my septics have leach pits but one in Florida is a leach field. My house has two leach pits because of the size of the system.