My home is over 20 years old. I have two levels and a basement all with bathrooms. My problem started a few years ago. The toilet in the basement will not flush properly and the sink and the toilet will gurgle and burp when the upper restroom shower is running.
I have removed and inspected the toilet, flushed the vent from above with a water hose, and dug up the septic tank allowing it to flow freely but still no solutions. Am I missing something that I should try?