We have a blocked drain in our garden. I've had my arm down it and part way round the u-bend, pulling out a ton of crap, but it's still blocked. It looks like this in cross section (forgive the amateur art!).
The gap at the bottom is only big enough for me to get my hand in, and feeling upwards, i can't feel the blockage. There must be a pipe going sideways (to the left) around where the question mark is.
My question is, how can i clear that? I feel like drain rods won't work due to everything being so right-angled (the whole drain is made from bricks) - that it will be too tight for them to get round the corners.
Another option is some sort of chemical which I fill up the whole drain with before leaving it to sit for a day or whatever. That might work I guess.
Any other ideas? Would drain rods get round it do you think?
Grateful for any advice...