In a reassessment of the impact of Al3+ supplementation at 300 mg/l on the performance of UASB reactor by Boonsawang et al., it was seen that the reactor with Al3+ supplementation could provide a large granule size (0.8 mm) within 35 days, whereas granules of this size in the reactor without Al3+ supplement became visible only after 63 days. Moreover, the Al3+ spiked reactor could reach steady state within 45 days, 10 days earlier than the control reactor did.