Likely related to this was the disappearance of the anomalous power loss at 25 kΩ in the corresponding power density curve (Figure ). However, overshoot was still observed at low external loads (Rext < 8 kΩ). The average absolute overshoot between t=61 and t=109 days was measured as ΔĪOS=88.7 ± 7.1 mA m 2 (with the corresponding average overshoot factor of ΘOS=13 ± 2%), which is a reduction from the overshoot at t=48 days (ΔĪOS=173 mA m 2 , ΘOS=19%). Also, Īmax after shear erosion was lower than was observed while overshoot was present. This is likely related to the reduced biomass after erosion, but the internal resistance also appeared to be higher after erosion compared to before onset of overshoot (Supplementary Materials, Section S5). Taken together, shear erosion made some improvements in the MFC performance, but it is clear that the MFC was still in a health-compromised state.