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Alkalinity and CO2

Alkalinity in aquaponics aquaculture systems it a critical consideration to the designer and to the farm operations. Any aquatic system, that rely on bacteria for nitrification, need some form of acid neutralizing capacity to offset the acid produced by bacteria.  Alkalinity will maintain a stable pH and reduce stress on fish.

In recirculating aquaculture systems alkalinity is consumed at a rate of two equivalents per mole of ammonia nitrified. 1 This is the cause of constant pH reduction in recirculating aquaculture systems and the need for constant addition of base compounds.

Aside from the negative effects of low alkalinity in aquaculture and aquaponics, the carbon cycles and the relationship between CO2, pH and Alkalinity are equally important to the design and operations of aquaculture and aquaponic farms.

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