Filter Foam Replacement Set for FiltoClear 8000 (2nd Gen)

For FiltoClear 20000/30000. The heart of a filter is its filter sponges – especially this filter sponge set, which combines blue and red sponges in a compact design. Red filter sponges have fine filtration properties, while blue ones have coarser properties. This means that, depending on the water flow rate, either small or only larger particles are trapped in the sponges and thus removed from the pond water. But they don't just perform classic filtration; they also provide ample habitat for bacteria. This small biological oasis within the red filter sponges 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). The blue filter sponges provide additional support in the denitrification process.