Higher power densities could be reached, but for a shorter period of time, by using smaller sized chitin particles. Power increases from the addition of organic substrate implies the potential to electively increase power levels of benthic MFCs for a certain period of time, but not being sustainable in the long term unless organic substrate is continually introduced. This also could lead to sediment MFCs being situated in areas of high organic flux, such as underneath fish farms or sites of agricultural run off, which could provide an increase in organics for oxidation of the MFCs.