Abstract: A fracking fluid hydration unit is provided that has a plurality of hydration tank sections wherein shear is added to the hydrated fluid flow via a recirculation hydrated fluid jetting system.

Abstract: A fracking fluid hydration unit is provided that has a plurality of hydration tank sections wherein shear is added to the hydrated fluid flow via a recirculation hydrated fluid jetting system.

Abstract: A fracking fluid hydration unit is provided that has a plurality of hydration tank sections wherein shear is added to the hydrated fluid flow via a recirculation hydrated fluid jetting system.

Abstract: An improved control circuit which may be incorporated into a medical transcutaneous nerve or muscle stimulator for disabling the output from the stimulator to stimulation electrodes connected thereto upon the occurrence of an undesirable output event of the kind which may result in an electrical shock or burn to user of the stimulator. This disablement by the control circuit may be triggered when electrode impedance exceeds a threshold level, or when the current level of the output undergoes excessive change, or when the power source to the unit is interrupted. Included may be visual signaling functions.

Abstract: A current monitoring and control circuit for use with a medical stimulation device for monitoring the exciting current to stimulation electrodes connected to the device is provided having a disabling component to inactivate a signal generating circuit resident within the stimulator. Operation of this disabling component may be controlled by the functioning of sampling and detection components preferably connected to the output of the signal generator and triggered by an undesirable output signal surge. Included may be visual signaling and metering functions.