Red Filter Foam for BioTec 5 / 10 / 30

For BioTec 5, 10, and 30. The heart of a filter lies in its filter sponges: Red filter sponges have excellent filtration properties, as they function optimally at a medium water flow rate. This means that small dirt particles simply get trapped in the sponge as the water flows through, and are thus removed from the pond water. But filter sponges don't just perform classic filtration; they also provide ample habitat for bacteria. This small biological oasis ensures the conversion of toxins produced in the pond: Toxic substances are transformed into harmless, but algae-promoting substances (nitrification), which are then converted into naturally occurring gases (denitrification). Together with the blue filter sponges, they demonstrate excellent filtration performance.