Be careful, that can plug up drains.
I use a large net pot set in a 5 gallon bucket with a drain spout on the bucket bottom side. I rinse hard, shake the LECA, rinse hard, shake the LECA and rinse hard again. Dump and repeat with more LECA.
Just moving that stuff around creates more dust so keep that in mind. Clean it and pot with it, don't be dumping it back and forth in containers.