A critical variable associated with waterway health. Nutrient surges can cause oxygen depletion, even in the presence of a floating island. Dissolved oxygen is vital for the health of a waterway, for fish productivity, for bio-complexity. Phosphorous-consuming microbes need aerated water. If oxygen is depleted, fewer species can grow in the water, and monocultures take over. A horizontal aeration system not only adds dissolved oxygen: it helps to circulate the water and inhibit stratification, as well as release trapped gas as the bubbles break the surface tension of the water (chimney effect).

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