in fact, "...The first is a ...

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in fact, "...The first is a separator made of corrugated sheet metal, which removes the largest amount of oil and suspended solids. Then the water flows through flotation cells where injected gas or oxygen attach to the oil droplets or particles, so that they can be skimmed off. Finally, the water is forced through filter chambers filled with walnut shells. The shells have the property of remaining oil and impurities absorb. "Other filter materials such as rice and palm kernels would also work. But walnut shells come with the pressure and the temperature works best for you, "says Suarez..." For more info: http://www.energy.siemens.com/hq/apps/search/en/index.php?collapse=true&SCSConfig=ENERGYSIEMENSCOM-WWWHQEN&class=search%2Cbanner%2Ctext&q=walnut+shells