1. A biofilter has some similarities with a constructed wetland, but is usually without plants. 2. Stable environmental conditions and regular maintenance are required to ensure the biofilter is operating efficiently. 3. One of the main challenges to optimum biofilter operation is maintaining proper moisture throughout the system. 4. For large volumes of air, a biofilter may be the only cost-effective solution. 5. Fish require oxygen to metabolize food and grow, as do bacteria communities in the biofilter . 6. The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system. 7. A septic tank and aerobic and biofilter units exist which represent scaled down versions of municipal sewage treatments. 8. A biofilter provides a substrate for the bacterial community, which results in thick biofilm growing within the filter. 9. Typically, a biofilter has two or three phases, depending on the feeding strategy ( percolating or submerged biofilter ): 10. Typically, a biofilter has two or three phases, depending on the feeding strategy ( percolating or submerged biofilter ):
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