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The Sludge Boiler accepts Sludge produced by other MFR Machines (e.g., the Sewer) and processes it to produce Clay, Sand, Dirt, and Soul Sand (in that order of rarity). The Sludge Boiler will output items to an adjacent chest or pipes. As with other MFR Machines, it runs on MJ power and can be turned off/on with a Redstone signal.
Warning: when the Sludge Boiler is running, you will suffer poison and hunger effects if you stand within three blocks of it.