Repl. foam set FiltoClear 20000 / 30000 INT

For FiltoClear 20000/30000 The heart of a filter is its filter sponges – especially this filter sponge set, which combines the blue and red sponges in a small space. Red filter sponges have fine filtration properties, while the blue ones have coarse filtration properties. This means that, depending on the flow rate of the water, small or only larger particles get caught in the sponges and are thus removed from the pond water. However, they not only perform the classic filtration function, but also provide plenty of living space for the smallest bacteria. This small biological oasis in the red filter sponges ensures the conversion of toxins in the pond: toxic substances are converted into harmless but algae-stimulating substances (nitrification), which in turn are converted into naturally occurring gases (denitrification). The blue filter sponges provide additional support in the denitrification process.