The video shows water sandblasting using a pressure washer. This is possible thanks to a suitable lance with a sandblasting adapter.

Today I tested wet sandblasting with a pressure washer. The effect is quite good but it takes an awful lot of time. Plus, it doesn't get dusty. Unfortunately, the outfit for such work is essential. Glasses or preferably a mask because the water splashes with sand. And, of course, rainwater with rubber boots.

See also the Verke siphon sandblaster test
   • 76l sandblaster VERKE with Amazon. Ho...  

If you want to buy such a wet sandblasting nozzle, click the link below
https://s.click.aliexpress.com/e/_ASCaeO

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