A. Yes, absolutely, Bacta-Pur® biotechnologies actually reduce methane and hydrogen sulfide. Methane and sulfides are produced by microboes, which can grow only in the complete absence of oxygen; they can actually be harmed or even killed by oxygen; they can actually be harmed or even killed by oxygen. This occurs in sewers, principally in grease and sludge accumulations, rather than in the water (particularly for methane). Regular use of Bacta-Pur® removes the grease and sludge accumulations thus removing the habitat of the trouble causing microorganisms. In addition to this, removal of scum and grease from the surface of the water brings the water into contact with the air and allows greater diffusion of oxygen into the water.