Keep your fish tank clean and fresh with the Service Kit for Fish Pod Aquarium from Interpet. This fantastic kit will help keep your fish's tank healthy and liveable. The pack includes 3 filter cartridges and 3 algaway pads that will clean and purify water, keeping algae at bay. Using these monthly will ensure your aquarium remains healthy, clean, clear, and algae-free. The 3 Month Service Kit is a high-quality filter media service kit for a CF1 internal cartridge filter. It contains 3 filter cartridges that clear and purify the water, and 3 algaway pads that reduce unsightly algae, ensuring a healthy, clean, and algae-free aquarium.