Prison officials at the Sierra Conservation Center near Jamestown say they´ll start using a mobile water-treatment system tomorrow as a temporary means of bypassing the facility´s clogged filtering system. The prison´s water filtering system has been backed up by silt in the water from the Tulloch Reservoir and forced prison officials to ration the amount of H-2-O available for inmates´ showers and cleaning. The prison has been trucking in extra water and on Friday officials began shutting off water to some bathrooms and sinks. Prison Lieutenant Jim Hurtado says a combination of low water levels at the reservoir and heavy rainfall has stirred up a lot of dirt in the water. The dirt has clogged the prison´s filtration equipment. Prisoners are being allowed to shower on a rotating basis. The Sierra Conservation Center is located near Jamestown and contains approximately 4100 inmates.