Description
The heart of a filter is its filter sponges: Filter sponges not only complete classic filtration, but also offer the smallest bacteria a lot of living space. This biological oasis in the filter sponges ensures that the toxins produced in the pond are converted: In the blue sponges toxic substances are converted into harmless algae stimulating substances (nitrification), which in turn are converted into naturally occurring gases in the red sponges (denitrification).
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