The presence of taste and odors in drinking water is an increasingly frequent problem for water utilities across Canada, the United States and the world. The earthy/musty odors produced by geosmin and 2-methylisoborneol (MIB) are one of the most problematic types of taste and odors. Both compounds are resistant to chemical oxidation and are difficult to remove by conventional water treatment methods. Ozonation followed by biological filtration may offer an alternative means of effective removal. In this research, bench scale experiments were conducted using four parallel filter columns containing biologically active anthracite and granular activated carbon (GAC) media and sand. The factors under investigation were temperature and media type. Source water consisted of dechlorinated tap water to which geosmin and MIB were added as well as a cocktail of easily biodegradable organic matter (i.e. typical ozonation byproducts) in order to simulate water that had been subjected to ozonation prior to filtration. The results indicated that both temperature and media (GAC vs. anthracite) were important factors. Temperature had a significant effect on geosmin removals, especially in GAC filters. A decrease in temperature from 20oC to 8oC resulted in a decrease in removals as high as 37 percentage points. Media had a significant effect on geosmin and MIB removals at both 20oC and 8oC. The difference in geosmin removals between the two types of filters was much greater at 20oC (e.g. geosmin removals reached a maximum of 30 percentage points higher in GAC filters than in anthracite filters). The differences in MIB removals between the two types of filters was quite similar at both temperatures. Includes 20 references, table, figures.