Okay, sure you don't need a "pool" for the skills demonstration and to introduce the basics. But, a "pool" is usually the most widely used tool as they are readily available where as a shop may have to drive for hours to get to water. And if you have to drive for hours to get to water that is going to turn a lot of people off who are going to say screw it and not do scuba. If a shop has other sources readily available to them for the training then they should utilize those resources. And if it's a lake then so be it. I think the "pool" sessions is just a generic term for those sections of training where a controlled environment is needed/used by the trainer. Just because the "pool" happens to be a lake or a cove in a wide section of a slow moving river is a matter of semantics. Heck, you hear the British refer to the USA as being across the pond from them. Well, the "pond" is the Atlantic ocean. WOW. Big "pond". B