I'd imagine the only way is to chip it off and possibly some sand paper to get the small parts off to smooth it out
Excuse me for answering with another question, but why on earth would someone put concrete in PVC pipe? Now the answer: Unless you're undertaking a tremendous project--e.g., replacing the wastewater system in a medium-sized city--there is no cost-efficient way of doing this task. Solution: Buy new pipe. Cut old pipe into 4, 5, 0r 6 foot lengths and sell them as lawn rollers. Just joking, but it sort of puts the price/cost factor into perspective, doesn't it?
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PVC or polyvinylchloride. IN other words ~ plastic pipe. k
Polyvinyl chloride PVC = polyvinyl chloride, a synthetic resin preparedd by the polymerization of vinyl chloride
Probably the wrong size flange. Is the flange a toilet collar? If so the pipe is probably 4 inch.
You have to determine how long the crack is and then cut out the bad section allowing for that which you can not see (hairline cracks). You will probably need the correct size pipe and connectors (couplings S x S) and PVC cement and PVC primer, a fine saw for cutting the pipe. Dry fit everything making sure the new section of pipe is of the correct length. There is a small situation in which you need the flexibility in the old plumbing to be able to attach the new section. You just have to think it thru. Ken
about 25 bucks per foot .