Basically, these filters are also flow though filters which have many advantages such as the rich supply of oxygen and high flow through rates.
Remaining fish food, fish excrement, decaying vegetation and also petals, leaves and dust brought in by the wind pollute a pond with a surplus of nutrients. The consequences are often algae growth and murky ponds. Increased decomposition processes also pollute the pond with toxic substances, which will reduce plant growth and endanger the health of fish or other occupants of the pond.
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