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Whether you are in the deserts of Arizona or elsewhere, Caliche is a common problem for drillers. It is a layer of soil in which the soil particles are cemented together by calcium carbonate (CaCO3). These layers may form at or below the soil surface, but wherever a driller encounters it, if he doesn't have the proper rock-drilling tools, he's in for a headache!
Configure a pullback device to work with any Borzall bit.