Although it's been in use since the mid-1970s, some drillers are not yet familiar with the reverse circulation drilling technique.
Let's be realistic - because equipment is so expensive, most drillers aren't keen to jump up and buy a new system every time a technology is introduced. Fair enough, but being informed of these trends and staying on top of the game can help even if you're not in the market for a new system.
Although it's been in use since the mid-1970s, some drillers are not yet familiar with the reverse circulation (RC) drilling technique. "It's growing in popularity, but it's not really a mainstream thing yet," says Alicia Holte of Holte Manufacturing Co., a company in Eugene, Ore., that makes complete reverse circulation systems and was kind enough to give a brief RC tutorial.