Clog? Full tank?
So I start out on the plumber page a few weeks ago and I thought the issue was fixed but now I’m thinking it may be something to do with the septic tank. We started having issues with one sink in our bathroom, we have a double vanity and the sink we don’t use and haven’t ever used started gurgling when we would flush the toilet and the toilet water would rise ( it’s the sink on the right side, farthest away from the toilet and closest to the septic tank which is I would say maybe 12 feet outside from the sink possibly a little further ). The plumbers recommended changing the studor vent and I thought it was fixed bc everything was flowing as normal, no gurgling and no water rising in the toilet. I forgot to run water in that sink so there wasn’t any water in the p trap and I started smelling something and then remembered. After I ran water in that sink the same thing started happening again 🤦🏻♀️ everything flows fine if we take the studor vent off. We have snaked the pipes more times than I can count besides the toilet bc I realllly didn’t want to pull the toilet but I did yesterday and I also ran the water hose in the bathroom window and ran water in every pipe a few weeks ago and have even poured gallons in the toilet and nothing backs up. Me and my fiancé both took turns snaking it from inside the house and the cleanout pipe outside and from the toilet drain you can see the snake go down the cleanout pipe to the septic tank pipe, it’s just a 25 ft manual snake with a drill attachment thingy. We also snaked to the septic tank and found nothing at all. We had the tank pumped a little over two years ago but there is standing water in the cleanout pipe. The water is several inches below where our bathroom drains into that pipe and we haven’t had any back ups. Some things I’ve read say it’s okay for water to stand in that pipe as long as it flows and then I’ve read that water should never be in that pipe, I don’t know how it flows down the cleanout pipe with the studor vent on bc taking the cap off to watch the water draining would pretty much be the same thing as taking the studor off right?? That pipe is only to our bathroom, our bathroom was added 12ish years ago and they just ran the pipe from our bathroom straight to the tank. When we had it pumped, the man wanted to know what all came out of that pipe and it’s strictly our bathroom. I think that is everything! Any advice or ideas on what it could be that we could possibly fix or try before we call our septic guy back out??