Where are the Flakes in My Pool Coming From?

In this video of the Pool Man University we talk to Bob Lowry about the Flakes that are in your pool and where they come from. Hint. Its probably calcium carbonate. Listen to Bob explain the reason for those flakes.
Links to Bob's Books:
Pool Chemistry for Residential Pools
www.amazon.com...
Pool Chemistry for Service Pros
www.amazon.com...
Easy Pool Chemistry
www.amazon.com...