Abstract: Metal hydride compositions comprise a mixture of (a) from about 1 to about 10 parts, by molecular weight, of at least one metal selected from the group consisting of silicon, aluminum, tin and zinc; (b) from about 1 to about 3 parts, by molecular weight, of an alkali metal hydroxide; and (c) from about 5 to about 10 parts, by molecular weight, of water. These compositions may be used in various applications, including, among others, methods for separating coal fines from coal fine waste slurries, methods for cleaning and desludging hydrocarbon storage tanks, methods for providing fire-retardant properties to composite materials and methods for providing corrosion protection to metal parts.

Abstract: A supplementary self-contained cleaning fluid distribution system provides for the selective flushing and cleaning of the waste fluid holding tanks of a recreational vehicle. From an external connection cleaning fluid is directed to grey water or sewage tanks respectively, by means of a tank selector and backflow prevention system. Components of the system include a pair of normally closed solenoid valves and a normally open pressure switch responsive to the delivered pressure of the cleaning fluid. A predetermined reduction of the cleaning fluid supply pressure automatically isolates the vehicle system from the external fluid supply.