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Thanks all for your suggestions.
The manufacturer of the shower drain got back to me. And it turns out they changed the design of the siphon to one that's easier to clean. So that alone is worth the €26 in my opinion.
If the new siphon doesn't do the job we'll get a professional. After being traumatized in our old home my sister doesn't want to mess around. The problem is between the drain and the bigger pipe going down. The toilet and sink have no problem. It might be the siphon or it might be in the shower drainpipe.
But how on earth did they ever think of designing a siphon that is also a hair catcher that can't be opened up to properly clean.
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