old sink drain soakaway, reconnect to faraway sewer pipe

somebodude

So an old house where the kitchen sink goes out through the wall into the ground and soaks away.

The bathroom, other side of the hall, plumbs into the soil pipe going into the septic tank.

But to connect the sink to the sewer, it has to go four meters across and drop 1 meter, as soil pipe is just below surface, a hand's breadth.

This would mean kitchen sink pipe going down underground then back up to connect to soil pipe !

what's the solution here, just have a big dirty sump and grease-trap to unblock every few months? a macerator and pump? big expense to lower the soil pipe half a meter?

tnx

somebodude

beuller ?

antoinolachtnai

Can you run a pipe on the outside of the house from the kitchen, just below ground level, to connect with the pipe running from the bathroom to the septic tank?

There may be reasons (good or bad) why the kitchen sink wasn’t originally connected to the septic tank and I would try to get expert advice on this before doing anything.

somebodude

yes that'd be the least complicated thing, but my concern is there really wouldn't be much of a drop at all, I could end up with a fairly horizontal section of 3 meters long where 'water' would accumulate..

antoinolachtnai

You don’t need much fall if it is laid properly and it is only water. You can put a trap or one way valve where the waste water pipe meets the soil pipe to make sure nothing runs back.

A bit of mostly clean grey water sitting in the pipe is not ideal but not the worst thing. You obviously have a load of water sitting in the garden as it is.

it beats macerators, pumps it trying to lower a pipe.

Really you need local advice to figure out what is feasible/desirable.