How does a semiclosed aquarium water system reduce dissolved wastes?

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Freshwater aquarium filled with green aquatic plants, rocks, and several small colorful fish swimming throughout the tank. — aquarium A freshwater aquarium.

In a semiclosed aquarium system, dissolved wastes are managed through the constant, regular addition of new water to the recirculating system.1

While semiclosed systems function similarly to closed systems, this continuous connection to a water supply helps control the accumulation of metabolic wastes without the high costs associated with the temperature control and pumping required by open systems.1