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B&Q£14.99Visit shop B&Q - 6 X Compatible Tetra Easycrystal C250/300 Filter Pack
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This 6-pack of filter cartridges from Finest-Filters is designed for aquarium hobbyists who own Tetra EasyCrystal C250 or C300 FilterBox systems and seek a cost-effective way to maintain pristine water quality. These cartridges provide robust mechanical and chemical filtration, effectively removing debris and impurities from your aquatic environment to keep it crystal clear. However, users should note that these are third-party compatible replacements and not original manufacturer brand filters, requiring careful alignment during installation for a secure fit.
| Brand | Finest-Filters |
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These are specifically designed for the C250 and C300 FilterBox models; they may not fit correctly in other sizes or series.
A quick rinse in dechlorinated water or aquarium tank water is recommended to remove any loose carbon dust before installation.
For optimal filtration performance, we recommend replacing the cartridge every 4 weeks.
No, these are refill cartridges intended to be used with your existing plastic EasyCrystal filter frame.
While intended for freshwater environments, the mechanical filtration properties function similarly, though carbon longevity may vary based on specific water chemistry.
The filter media is likely saturated with debris. Replace the cartridge with a new one to restore proper flow.
Check that the cartridge is seated correctly in the plastic frame and that there are no gaps allowing water to bypass the media.
Ensure the FilterBox is firmly attached to the aquarium glass and that the cartridge is pushed all the way into its housing.
To install these cartridges, ensure you have the original plastic EasyCrystal frame. Remove the old, saturated media from the frame and discard it. Slide the new Finest-Filters cartridge into the frame until it clicks or sits flush. Place the assembled cartridge back into the FilterBox. It is recommended to perform these changes every 4 weeks to prevent the carbon from releasing trapped toxins back into the water. Never wash the cartridge under tap water, as chlorine will kill your beneficial bacteria; always use a small amount of tank water if you need to perform a quick rinse.
