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America Auger , Vermeer and Ditch Witch are top 3 directional drills manufacturer in the world, especially for the HDD application, water well, construction and other engineering. 
All of the above HDD rig manufacturer has a lot of dealers all around the world, in some countries, there is still no exact regulation for HDD mud treatment; but in some HDD applications, mud recycling is necessary, plus more and more countries issued much more strict regulations on environment protection, used drilling fluids for HDD can not be disposal directly, you will need a HDD mud cleaning/recycling system. GN solids control is a specialized manufacturer for HDD mud cleaning/recycling system.