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If you have been in Paraguay more than a month, you have probably heard of the “Aquífero Guaraní” in a sentence like “Paraguay is located on the world’s largest aquifer, the Aquífero Guaraní. It supplies Paraguay with so much water that wherever you drill, you will get lots of water in your well.” People picture the aquifer like an underground bathtub in which you can tap in anywhere to pump out the water. The funny thing is that drillers don’t agree with that. A driller wi

In Paraguay, drillers stop when they hit granite. In Sweden, driller know they have to drill in granite. So what's the difference? Sweden has a 150 years long history of documented wells in granite. Moreover, in Sweden there is granite everywhere, so drillers, hydrologists and geologists have been forced to figure out how to extract water from that crystalline rock. The famous geologist Erik Nordensiöld described a long list of successful case studies of drilling for water in