hi Brian glad to help u out you need to put your machine on a a lean best to have it in a way that u can see at the back of the machine.your waste pipe is connected to the outlet of the water pump.at one end of your water pump is a white cap this can be turned anti-clockwise, this is the area you need to clean out if rocks or nails etc clog it up
take care
brad
brad
April 2005