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after about 2 or 3 minutes of taking a shower in the master bath the toilet starts to gurgle and the shower fills up with water. the 2nd bath also fills up and neither toilet will flush..after anywhere between 30 minutes and 30 hours all the water will suddenly flush out..it is unpredictable, sometimes its fine sometimes its not. my first thought was a venting but the 2 inch pipe appears clear. i have snaked and ran a pressure bladder through the main line and through the shower drain to no avail. i just have to sit and wait for it to drain by itself. the septic tank is also empty. thanks for any help
 

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Could be that the vent above is blocked (birds nest, debris, etc...). Have you tried snaking from the stack that penetrates the roof?
 

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I'm no expert with plumbing but man, this sounds exactly like my coworkers problem. He has a mound system outside of town. Every time they'd flush or the washer would drain they'd get back up out of their lower-level floor drain, and it would randomly drain normally.
We used a bladder type pressure cleaner in the main, and could see the water flowing into the holding tank. Snake always came back clean. It ended up being caused by a plugged vent pipe outside the house at the tank, found pretty much by accident by his father in law. He never knew that vent was even there. It didn't protrude from the ground much.
Hope this helps somewhat. It drove him nuts for 2 weeks.
 

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after about 2 or 3 minutes of taking a shower in the master bath the toilet starts to gurgle and the shower fills up with water. the 2nd bath also fills up and neither toilet will flush..after anywhere between 30 minutes and 30 hours all the water will suddenly flush out..it is unpredictable, sometimes its fine sometimes its not. my first thought was a venting but the 2 inch pipe appears clear. i have snaked and ran a pressure bladder through the main line and through the shower drain to no avail. i just have to sit and wait for it to drain by itself. the septic tank is also empty. thanks for any help
So, you realize your back up may include sewage. I would stick to 90 second showers until you figure this out. Or showing in rubber boots.
 
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