Figure 1 bottom section help add_ together significant biomass inventories which leads to increase process stability and higher removal. The cross flow media modules also function as effective gas-liquid-solids separator further enhancing biomass retention. Fig. 1: Upflow Hybrid Anaerobic Filter [77] The systems can be further qualified based on process rate, which were low-rate systems and high rate systems. Thus one can have low-rate with suspended-growth anaerobic system which includes bulk volume reactors and anaerobic contact reactors. Both these approaches are efficient at retaining flocculent (i.e. non-granular) sludge owing to lower organic and hydraulic loading rates than the high-rate systems. Particularly they are very well suited for industrial applications that do not granulate well or have higher than desirable amounts of troublesome constituents, example as high levels of organic and suspended solids. The systems can be further qualified based on process rate,