Snorkeling a crystal clear river

I enjoy the Rock River at my son’s home on Riverview Drive in Janesville and have fun making videos about the river's interesting history.
And I like to discuss the Rock with a Florida friend who also lives by a river.
Exchanging river videos with him recently, I got to see why he retired on the Rainbow River and goes snorkeling there every morning--the crystal clear water which comes out of the ground from Florida’s fourth largest spring.