Your hands-on class probably saved me thousands of hours in experimenting. I have known how to build artificial rocks/boulders for 25 years but unless I took off my glasses or drank 6 beers, they always looked artificial. My first job after your class could pass for anyone's inspection and they would not think this was man made. Recovered your class fee on the first pool and more important the customer was dazzled. Again, thanks.

Jim Johnson
Johnson Pools
Laredo, Texas