Quick background first.
I chose to build a passive house using an insulated foundation system.
This means that all my soil pipes etc. leave the house through the floor.
This ultimately means that the pipes are much lower than standard 2 - 3 ft before they make their way to the septic tank.
The setup is that waste is gravity fed from the house to a septic tank. Planning was granted a long time ago so yes it's an actual septic tank.
The effluent leaves the tank again by gravity and feeds into a holding tank.
This tank contains a pump with a float switch.
When the float hits a certain level the pump kicks in and drives the effluent up to the percolation box.
I discovered over the last week that due to springs etc. caused by the weather etc. that both tank (holding and septic) are leaking ground water where the soil pipe enters the tanks. This has resulted in the pump running frequently and saturating the percolation area. We came within a couple of showers of backed up toilets!
So I got the track machine back on site to dig and we exposed the pipes. We also had a pump keeping the water level down so that we could attempt a reseal.
The photo below sums it up.
You can see the pipe linking the holding tank and septic tank fully submerged. I will say that at the time of this photo I was very pleased. Neither tank was leaking any water so I'd successfully sealed both. I used one of those new snag list emliminating sealants which allegedly even seal under water.
This evening I am deeply frustrated to see that after back filling the joints have failed again. The backfilling must have moved the pipe and broken the seal. They are much better than the were a week ago but I want them fully sealed.
Can anyone advise as to how this is normally done. I appreciate that my circumstances are not typical.
My current next move is to empty the tanks entirely and attempt to seal the tanks from inside i.e. no more digging and hence eliminate the risk of breaking the new seal.
Note: there is no option to draw the area around the tank to somewhere else. Due to all the above,we're simply too low in the ground and have no where to drain it to without using a pump.
All thoughts hugely appreciated or recommendations (by PM) on anyone that resolves such issues.