Fluval C4 Power Filter is the world’s only 5-stage clip-on HOB filter for aquariums 181–265 litres (40–70 US gallons). Two mechanical stages trap large and fine debris, chemical stage with activated carbon removes toxins, and two biological stages with Bio-Screen pad and C-Nodes trickle chamber ensure fast nitrification. Patented refiltration system, cleaning indicator, independent stage management. Made in Italy. Suitable for freshwater and saltwater aquariums.