Waterwell drilling rig, it is usually dig small height hole may around 50~300m or more. Mostly they do not match mud system,even they have, only smaller mud system request. 
But as the water well drilling rig need to be moved very frequently, for easy rig up and rig down, mud system and every solids control equipment should be very convenient to move.
GN have designed many fast move small mud system for water well drilling. GN make mobile fast move system from mud recycling to mud mixing to max. compact design. So the total system can be move no need to disassembly anything.