Washing rocks

I set up a tray for washing some pebbles we had collected on the walk we did the other day by our house. We are lucky enough to live near plenty of bridle paths, which allow us to have access to good walking routes right on our doorstep.  Anyway I have got a little off topic, which is easy to do as I am easily distracted. Here is the tray:

Nuh about to begin the activity

Zuh playing with the water