Replacement foam red BioSmart INT

For BioSmart 14000 and 16000. The heart of a filter is its filter sponges: Red filter sponges have fine filtration properties, as they function optimally at a medium water flow rate. This means that small dirt particles are simply trapped in the sponge as the water flows through, and 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 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 deliver excellent filtration performance.