Clogged drain. Sand coming out. What's going on here? : r/Plumbing

I came back to my sink today and it looks like this. Any ideas of

10 Quick Ways To Fix A Clogged Drain

How To Unclog A Shower Drain

Why You Should Never Let Sand Near Your Bathroom

Drain Field Cleaner Tablets by Dr Pooper. Clears

Clogged drain. Sand coming out. What's going on here? : r/Plumbing

4 Signs Your Main Sewer Line Is Clogged

Clogged drain. Sand coming out. What's going on here? : r/Plumbing

The Tell-Tale Signs Your Sewer Line May Be Clogged - Plumbing

DIY Clogged Drains: Do This Not That