"When the housing bubble burst in late 2008 and early 2009, the domestic water well drilling industry also took a big hit, especially in certain areas of the country. .... Fortunately, for some, there were other markets to explore."
"This article is going to deal with a couple of problems that have been and, in some cases, still are inherent to the design of many submersibles – plugged parts and underperforming check valves."