Keeps water crystal clear and healthy Easy to use replacement filter media Purifies water and reduces unsightly algae Ensures long-term health and well-being of your aquarium fish and plants For cold water and tropical aquariums Size Name: CF1 | Style Name: 3 Month Product Description Filter cartridges need to be replaced because cartridge floss will become blocked with trapped material and the carbon capacity for removing toxins will become exhausted. the algaway pads ability to remove algae food will be exhausted. Replace your cartridge filter once a month to keep your aquarium healthy, clean and algae free. Simply remove and discard the old filter cartridge and replace with a cartridge. After cleaning your filter, it is advisable to add Interpet quick safe start to boost the beneficial bacteria population of your aquarium. Services packs for Interpet Internal Cartridge Filters are available in one and three month packs. This three month service pack is Suitable for an Interpet CF1 Internal Cartridge Filter. Safety Warning This product is for animal use only and should under no circumstances be administered to any animal other than that which is stated for. See all Product description