Only one one the holes has ever flushed cuttings (pasty water) all the way out of the hole. The rest (other than the empty hole) dont fill much past 15 feet down and then it all still runs away before getting to the surface. So that at least is ok. Luckily no gravel. Its a real pain hitting a section of quartz though. cuts too fast, crumbles, and then its like trying to drill ball bearings until you get passed the mess.
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