I was under the house yesterday trying to clear a clog. I opened up the clean out fitting and saw old, hardened sewage coating the bottom of the piping. When the clog cleared, water was passing over the old sewage. The piping was installed about a year age, and was coating the bottom of the pipe (about 5-10%). Is this normal? If not, is there anything I can put down a drain (like Rid) to clean out the piping?

Thanks in advance

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The piping was installed about a year age, and was coating the bottom of the pipe (about 5-10%). Is this normal?

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I think I would question what has been put down the sewer? Has a brick layer been cleaning his tools in the laundry sink.

Does the water flow freely at a good rate? Any tile work done lately? Is the pipe plastic? Did you dig down under the built up sewage to see what was on the bottom of the pipe? Back to you, Tom

If it is new plumbing, the guys before me probably have the best answer. The drain line should be at about a 2% slope. If the slope is too steep the water runs faster than the solids and if is too flat things plug up more easily. Some residue is probably normal, but if the things mentioned by the plumbers are present it probably won't matter what the slope is. If it is too heavy to be carried by water it will settle.