Koller Products Small Aquarium Filter Cartridges, 6-Pack with Activated Carbon

Koller Products Small Aquarium Filter Cartridges are ready-to-use replacements designed to remove fish waste and debris, with dual-sided poly-fiber floss and activated carbon in a six-cartridge pack.

• Six fully assembled cartridges — keep replacement filters on hand.
• Dual-sided poly-fiber floss — captures fish waste and other debris.
• Activated carbon — supports clean aquarium water.
• Small size for compatible Koller Products and Hawkeye power filters — match the cartridge size, not just the aquarium capacity.
• Designed for easy installation and replacement — change the cartridge without getting your hands wet.

Fish waste and other organic pollutants can build up in aquarium water. These replacement cartridges are made for routine filtration in compatible Koller Products and Hawkeye aquariums, helping maintain clean, clear water as part of the aquarium’s filtration system.

Which aquariums and filters do these Small cartridges fit?

They fit Koller Products and Hawkeye power filters that use Small-size cartridges, including the following aquarium models: AquaTunes 2.5-gallon (9.5 L) and 3.5-gallon (13.2 L) Aquariums with Sleep Sound Machine; AquaView 3-gallon (11.4 L), 4.5-gallon (17.0 L), 5-gallon (18.9 L), 6-gallon (22.7 L) 360, 6.5-gallon (24.6 L), and 7-gallon (26.5 L) Aquariums; and Smart Tank 5-gallon (18.9 L), 6.5-gallon (24.6 L), and 7-gallon (26.5 L) Aquariums. The cartridge measures 2.38 in x 0.75 in x 5 in (6.05 cm x 1.91 cm x 12.7 cm).

• Filter compatibility is based on the Small cartridge size.
• Compare your existing filter cartridge size when choosing a replacement.

How does the cartridge filter aquarium water?

Dual-sided poly-fiber floss removes fish waste and other debris, while the cartridge’s activated carbon helps keep water clean. Together, these filtration materials are designed to remove organic pollutants and support clear aquarium water and healthy fish. Each cartridge comes fully assembled and ready to use.

• Two-sided floss provides a surface for debris removal.
• Activated carbon is included in the assembled cartridge.

When should I replace the filter cartridge?

Replace the cartridge monthly for optimum filter performance, or sooner if it is heavily soiled or water flow has reduced. The six-pack provides multiple replacement cartridges for ongoing filter maintenance. Installation and replacement are designed to be simple, without getting your hands wet.

• Use the monthly interval as a routine replacement guide.
• Replace sooner when heavy soiling or reduced flow calls for it.

This cartridge pack suits aquarium owners whose Koller Products or Hawkeye power filter takes a Small-size replacement. It is intended for those compatible filters and listed aquarium models, rather than every filter that happens to serve a similar tank capacity. Its fit is defined by the Small cartridge size and the compatible filter models above.