I recently cleared all the rainwater drains around my house - 7 in all as a lot of them had been neglected by previous owners and were full of rubbish. I also used a pressure washer and most of the drains now run freely. One of them round the back was not so easy. It refused to clear. I put the high pressure hose attachement ( the sort with reverse direction jets and one forward facing one) down and still the level just kept rising. In the end, I just stuck an old mop down it and just vigorously pumped it. It seemed to clear. I came home from work tonight and the drain is now full to the brim with poo!This drain is about 6' from main soil stack.
Any ideas?
Any ideas?