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EHEIM Undergravel filter suction principle


The EHEIM Undergravel filter with suction principle works as an additional biological filter. The water flows through the gravel in the Undergravel filter. It is particularly suitable for marine water aquariums and fresh water aquaria without plants.
https://www.aquaristikshop.com/aquaristic/EHEIM-Undergravel-filter-suction-principle/354100/
EHEIM Undergravel filter suction principle