Hello everyone! I need some informations about the using of DTH (down the hole hammer) , and its implementation in cohesive and non-cohesive soi...

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Hello everyone! I need some informations about the using of DTH (down the hole hammer) , and its implementation in cohesive and non-cohesive soil, work methods and also bits, casing types and recomandations for drill. We want to use it on water wells drilling in Romania, Europe. In Romania the soil are variates from non-cohesive to cohesive and hard rocks. We want to learn more about the drilling with DTH and if are exceptions of using it. Best regards, Madalin Neagu SC FORMIN SA https://forminhidro.wordpress.com/www.formin.ro