So therefore excluding the obvious trap issue to septic of the jacuzzi, there is a positive pressure trying to get out. I will mention that there is a trap under bathroom sink which I made sure had water in it prior to final test. So therefore the gas must have moved the water up just enough to escape in.
My guess (being a newbie home owner, never dealt with plumbing before) is that the pipe going to the roof is blocked so no air is getting to septic tank.
My question is, if I get someone in to fix specifically the blocked pipe and place a trap at the jacuzzi, does he have to finish all jobs. Ie, I dont see a led from behind sink pipes to the air outside. Does he have to legally do all the work or can I just get what must be done now.
The kitchen has its own air valve thingy. Washer has its own trap.
Btw, having someone in to remove the chimney in early october at latest, at that time I want to bring the plumber in. In the meantime I actually have the opening of the 2nd sink overflow directed into extra hose and out the window.
Obviously cant do this for ever but only need a few weeks.