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Magically speaking, Saltpeter has a long, long, long history in hoodoo as an agent of magical protection in spritual baths and floor washes and as a shoe-sprinkle. Also, because it is an ingredient in Gunpowder, it is used in formulae which are hoped to produce quick (explosive) action, such as Block-Buster.
This type of pump operates using a piston in a reciprocating motion to pump fluids (similar to the piston in an automotive engine). These pumps are commonly used for pumping sludges. A pump used to pump both sewage and sludge. They are self-priming, valveless, positive displacement pumps. Two synchronized rotors rotating against each other create chambers between the lobes and pump casing. At the suction side the open chambers fill with the sewage or sludge.