/diy/ - Do It Yourself

OP here, since there are no helpful answers yet I will explain a bit more about the situation. I removed the toilet to rod the drain directly but it didn't work. For a while I was pissing into a jug and then pouring it down the hole which worked quite well, but then it started overflowing. I tried drain cleaner and acids but nothing worked.

I need to drill a hole into the pipe outside and rod it from below. I have a mains hammer drill but no chuck key. I tried drilling the pipe with a regular drill bit but I didn't get very far.

What kind of drill attachment do I need to drill a hole large enough to put a golf ball in? I'm not going to put a golf ball in, just to give it a size. THanks