Compatible With:
Small replacement cartridges for koller products small fish tanks filter; refilled filter cartridges s size for aquarium kits 4-10 gallons fish tanks and for betta aquarium filter kit.

Easy Installation:
Simply turn off the filter, remove the used cartridge, and flush the new cartridge under water to remove dust. After rinsing, insert the filter cartridge into the flushing chamber, make sure the filter cartridge fits completely into the chamber. Easy grip tab keeps hands from getting wet.

Premium Material:
The replacement for Koller fish tank filter contains natural coconut shell activated carbon, which has twice the adsorption capacity of ordinary activated carbon. It effectively removes odors and discoloration, quickly purifies the aquarium water.

Value 6-Pack Set:
This small aquarium filter cartridge contains 6 Pack S Replacement Filter Cartridges, each can be used for 3-4 weeks, total can be used about 8 months. For optimum use, please adjusted appropriately to your feeding habits.