Rotary air percussion and ‘down-hole-hammer’ drilling technique is currently the most commonly used technique in the groundwater exploration industry in hard rock formations. The Odex system with the installation of a permanent steel casing is used for the alluvium layers. The drilling into the hard rock formation uses a pneumatic reciprocating piston-driven ‘down-the-hammer’ technique to energetically drive a heavy drill bit to break up the hard rock formation.
The compressed air that is used to operate the ‘down-hole-hammer’ also blows the crushed rock cuttings or chips from the borehole to the surface. The groundwater that is found in the cracks, factures and cavities of the hard rock formation that flows into the borehole during the drilling process is also being flushed out to the surface.
Water Jaya Enterprise 
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