I have a problem with the plumbing in our 30's built Sydney house. The bathroom was updated some years ago but the plumbing at the rear of the house (kitchen, outside toilet & outside laundry) still has the original plumbing.
The problem first started with the outside toilet not flushing the water away but would fill the bowl and then slowly the water would recede. Then that went away and the back toilet started flushing again ok.
Then when having a shower the sink and toilet in the bathroom would start gurgling loudly. And when the bathwater was released the shower drain, sink and toilet gurgled loudly then stopped and the floor drain then overflowed.
I think I traced where the blockage may be, at the kitchen on the outside of the house is a large round drain that was full of badly smelling sludge - I tried removing as much of this as possible but still there is a blockage.
I then went into the kichen under the sing and cut a hole in the floor to see what was happening there. The small pvc pipe from the kitchen sink just sits inside a large terracotta pipe in the ground under the house. When running water in the kitchen sink it just goes in the terracotta pipe and then overflows and runs under the house!
I have tried using a plumbing snake and pushing it down this terracotta pipe without it going to far before it won't go any further - stuck at a bend I think.
I have also tried heaps of draino all without success.
I think it is time to call a plumber but was curious where this terracotta pipe would go to and if there were any other ideas on how to unblock it?