Sewer gas Sewer gas Sewer gas is a complex mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage. Sewer gases may include hydrogen sulfide, ammonia, methane, esters, carbon monoxide, sulfur dioxide and nitrogen oxides. Improper disposal of petroleum products such as gasoline and mineral spirits contribute to sewer gas hazards. Sewer gases are of concern due to their odor, health effects, and potential for creating fire or explosions. Sewer gas is typically restricted from entering buildings through plumbing traps that create a water seal at potential
Fire rock air and gas to funnel the flame through. Fire rocks come in many different colors and range in sizes from a half-inch to an inch. Fire rock is noted for its ability to withstand high temperatures of direct heat for prolonged periods of time. Unlike river rock, which is non-porous and highly explosive when heated, fire rock is considered a porous substance that is capable of releasing heat through tiny holes in its outer layer. Damp fire rocks have been known to "pop" and throw pea sized pieces of rock as they heat. The moisture that is caught in the