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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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I rent what home Depot has, don't know the brand. As long as the line is 4" it's good. It's not for small lines.

The manual snake you used was just to small. Use the drill type for smaller in wall piping. Use the big machine for main drains.

They have several bits: - do the guitar pick one first to get water moving. - come back with the more aggressive one next for roots - rental will have a spring bit for baby wipes or some such in the pipe.

Hose the chunks off at home. Clean it with soap at the car wash before you return it. Full deposit will be returned for a clean machine.