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Got pic related and located a blockage about 3,5 meters (11 ft) into the 100 mm (4") diameter drainage pipe. https://pic8.co/sh/82x3Ke.jpeg Tried concentrated lye but didn't help much, it only dissolves organic matter really well. For scale I could use hydrochloric acid but I'd have to use a boatload, I reckon.

Years ago i helped replacing part of the pipe which was blocked in several places with what I guess was urine scale. Pipework is plastic and about 30 years old. The pipe of concern is behind tiles and I'd rather not knock these off, if I don't absolutely have to.

Borrowed a manual drain snake from a neighbor but it's meant for small diameter pipe and a little too wimpy for the job. Looking at something like this now: https://pic8.co/sh/kScVqO.jpeg https://pic8.co/sh/DeUQ3D.jpeg

Does anyone have experience with these and can recommend one that doesn't leave me with a stuck snake in the pipework? Other suggestions?

Got pic related and located a blockage about 3,5 meters (11 ft) into the 100 mm (4") diameter drainage pipe. https://pic8.co/sh/82x3Ke.jpeg Tried concentrated lye but didn't help much, it only dissolves organic matter really well. For scale I could use hydrochloric acid but I'd have to use a boatload, I reckon. Years ago i helped replacing part of the pipe which was blocked in several places with what I guess was urine scale. Pipework is plastic and about 30 years old. The pipe of concern is behind tiles and I'd rather not knock these off, if I don't absolutely have to. Borrowed a manual drain snake from a neighbor but it's meant for small diameter pipe and a little too wimpy for the job. Looking at something like this now: https://pic8.co/sh/kScVqO.jpeg https://pic8.co/sh/DeUQ3D.jpeg Does anyone have experience with these and can recommend one that doesn't leave me with a stuck snake in the pipework? Other suggestions?

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[–] • 0 pt

Where does your pipe drain to? A sewer, or a septic system? If it's a septic, then you might have access to the pipe downstream of the blockage. Apply vacuum, if you can get it down to a few inches of mercury then you'd have about 150 pounds of air pressure pushing on the blockage from the upstream side.

Then again, drain pipe isn't rated for vacuum and you might just collapse the pipe on itself.

[–] • 0 pt

Sewer and it's not completely blocked, only about two thirds of the diameter. Thanks for taking the time.