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This study aimed at understanding the processes resulting from air bubbling agitation & evaluating the performance of seaweed biofilters under culture regimes that do not use electricity for agitation. Agitation by only water exchange & simulated tidal variation in water levels gave biofiltration performances that did not differ from aerated systems. In an irrigation regime nutrient removal rates were not significantly different between the irrigation treatment & the control. Biomass yield, however, was different. Gravity generated water flow regime gave higher nutrient removal rates, seaweed...