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no flush, sink gurgle

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?

Re: no flush, sink gurgle

Improperly installed or missing vent for the basement plumbing. A blocked or partially blocked waste pipe. Insufficient drop in the basement waste pipe. Are the most logical causes.

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