graveler

One who deals, sells, or works with gravel

In time to pass muster as a gatherer of stones, a graveller, a roller of paths, or it may be a setter of pulse rows, (though by the mass I misdoubt the last, hugely), but never to be taken for what you have vainly boasted yourself […]

A container filled with gravel or stones used as a filtration device

Alberger process Chemical Engineering, a process for manufacturing salt by heating brine under high pressure, then passing it to a graveler to remove calcium sulfate.

In the second step of the salt refining process the heated brine then goes into a graveler filled with cobblestones to remove the impurities.