IceCap Bio-Sphere Biological Filter Media

The IceCap Bio-Sphere Biological Filter Media packs a dense arrangement of small ceramic spheres into a sturdy 1-1/4in ball, giving beneficial bacteria a large, porous surface area to colonize. One 1kg box (40 balls) provides up to 18 gallons of biological filtration for freshwater, marine, or pond systems. Dimensions: 1-1/4in sphere Quantity: 40 balls per 1kg box Capacity: up to 18 gallons per box Best for: sumps, trickle filters, wet/dry filters, HOB filters, or directly in the aquarium Setup tip: rinse new spheres to remove dust before use, and optionally soak overnight in a bacterial culture to jump-start colonization. Rinse gently in tank water every 12 months, and never replace all your media at once — stagger replacements to preserve established bacteria colonies. Works well with: the IceCap Bio-Sphere Media Tower for organized, bag-free placement.