The stainless steel check valve prevents water that passes through the pump from being returned to the well.
The Redi-Flo2 electrical submersible pump, from Grundfos Pumps Corporation, is ideal for groundwater sampling or aquifer tests. These units provide high flow rates for purging and low flow rates for sampling when used with the Redi-Flo VFD (Variable Frequency Drive) , and they are fully capable of meeting the requirements of EPA-approved low flow sampling . With a simple push of a button, the VFD controls flow rates from 9 gal/min to as little as 100mL/min. Control valves are eliminated by using this portable VFD. The high-power Redi-Flo2 pumps provide smooth, uninterrupted water flow to depths of 280'. A unique design and superior materials allow for easy operation, decontamination, and maintenance as well as disassembly and re-assembly.Read More
For decades, commercial fishing for yellow perch was allowed in southern Lake Michigan. This persisted until 1996 when it was outlawed, giving perch stocks there some time to recover. Scientists had for some time assumed that this fishing ban would not affect the reproduction cycles of the perch quickly and that they were going to need a long time to revert back to the cycles they relied on before commercial fishing ever started. But new research led by scientists at Purdue University finds that maturation schedules of yellow perch in southern Lake Michigan are much more resilient than had been previously thought possible.Read More
Largely seen as pristine and relatively untouched by human activity thanks to its protected status, the portion of the Colorado River flowing through Grand Canyon National Park is anything but, according to recently published research. This is evidenced by high levels of selenium and mercury found in the fishes there. Scientists from many institutions were involved in the years-long work, full results of which have been published in the journal Environmental Toxicology and Chemistry. It was led by the U.S. Geological Survey, but perhaps the contributors from Idaho State University got the best end of the stick. They were looking into the food webs of the river to evaluate concentrations of selenium and mercury gathering in fish.Read More