said by Msradell:Must just be a trick of how you're seeing the picture, because it's definitely down-sloped. In the pic, it is running diagonally away from me, from the lower left, to the upper right. The high PVC you see is the washout, coming vertically to the surface. said by Raphion:
House is to the left, flow is going right. So the bell is on the upstream side of the tile.
Then you have a bigger problem because S__t doesn't flow uphill!