Cast Iron Pipe Corrosion/Buildup - Drain Clogging

Old 05-07-06, 07:58 AM
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Question Cast Iron Pipe Corrosion/Buildup - Drain Clogging

We have had our main sewer line clog three times in the last week. We have not had any previous problems. The sewer line under the basement floor is 4" cast iron. The house was built in 1965. The last time it clogged, we had a guy run a camera through it before clearing the clog. The clog appearred to be occuring near one of the turns. The camera actually broke through the clog.

The ID of the pipe appeared fairly corroded and rough near the clog. The ID does not appear to be significantly reduced, it just appears rough. We are thinking the rough spots are catching solids and TP and causing the clog.

Any advice on how to fix this problem before we saw up the basement floor?


Old 05-07-06, 08:29 AM
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Location: N.E. Arkansas
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There is no way to smooth out the inside of the pipe but the roughness may have been stuff collected on the sidewalls of the pipe which is the starting point for new clogs. I would suggest trying an enzyme drain cleaner such as Draincare by Zep. Enzyme cleaners cling to organic clogs and eat them. Augers and caustic drain cleaners merely punch a hole and leave the residue to start collecting junk again. My suggestion would be to sop up most of the water in the toilet bowl and add the Draincare there. This will give the line a full flow of water to get to all the inside areas of the pipe. Follow the directions on the label. It does take overnight so plan on doing this just before bed. You can find this product at Home Centers, hardwares, Walmart and even some larger grocery stores. About $8 for a multi-use jug. Good luck.

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