Check this before calling a septic pumper... it could save you hundreds.
This homeowner called because he had nasty liquid backing up into his tub when he ran water in another part of the house. He called a septic pumper and was told it would be 2 days to get to him and cost $1400 to pump both tanks. He called us and we were there within 2 hours.
No need to pump. He just needed a new filter.
One call saved 2 days of poop in the shower and about $1000.