Abstract: The fault-tolerant or self-correcting computer system is disclosed. The computer system that is provided with various sets of protections against failures that may be caused by space radiation, for example. Improved reliability of the system is achieved by scrubbing of the components on a regular schedule, rather than waiting for an error to be detected. Thus, errors that may go undetected for an extended period are not allowed to propagate and further damage the system. Three or more processors are provided to operate in parallel, and a controller is provided to receive signals from the processors and, using a voting logic, determines a majority signal value. In this manner, the controller can detect an error when a signal from one of the processors differs from the majority signal. The system is also provided with a scrubbing module for resynchronizing the processors after a predetermined milestone has been reached.

Abstract: An insert for a storm drain or sanitary sewer inlet such as are found in factory or warehouse floors, parking lots and car washes in which the insert holds one or more bags of filter media. The bags have a very open structure such as coarse weave cotton permitting water entering the drain to pass through each bag and the filter media inside the bag. The entire bag may be conveniently withdrawn from the insert and replaced as the filter media becomes saturated. Preferably, a first bag contains an absorbant cellulose particulate media which absorbs oils and greases and post non-volatile hydrocarbons and a second bag contains specially textured activated carbon which absorbs organically bound heavy metals and volatile hydrocarbons as well other VOCs (volatile organic compounds). Various types of filter media and configurations of these media also allows for the removal of dissolved heavy metals, and even the removal of pathogenic microbes.