It is a slow process.
Dissolve concrete in pipes.
If any hair was sucked down the pipe it would block the waste up because it was only a small hole through the concrete.
His advice to get the pipe fully clear was to use hydrochloric acid and allow it to sit in the pipe to soften the concrete so it could be flushed through the pipes.
How to clear concrete from drain pipes.
There are a variety of mechanical tooling to break and remove concrete from inside a pipe.
If the cement has accidentally and recently been put into a drain flushing it with plenty of water may be a simple but effective fix.
Muriatic acid is commonly available e g from pool suppliers and is dilute hydrochloric acid.
Being able to successfully clear concrete from drain pipes is a common question for drain clearing and pipe relining contractors.
Ways to clear concrete from drains.
I once had my electrical concrete embedded plastic conduit blocked with concrete.
The product is the most effective and time efficient product for concrete grout mortar cement based products that have blocked a drain.
Common problems this technique has is getting the tool to the concrete if the pipeline has multiple bends before you can access it and also the damage caused to the host pipe when using the mechanical tooling to break and remove the concrete.