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B&Q£17.99Visit shop B&Q - 8 X Fluval U4 Compatible Plain Foam And 8 X Compatible Polymax Filter Cartridges
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Designed specifically for aquarium enthusiasts using the Fluval U4 internal filter, these Finest-Filters replacement packs are ideal for hobbyists looking to maintain pristine water quality while managing algae growth. The combination of PolyMax cartridges and dense foam sponges provides a dual-action filtration system that clears water and eliminates odors; however, users must strictly adhere to a monthly replacement schedule to ensure these chemical-based adsorption media remain effective.
| Brand | Finest-Filters |
|---|
No, these are specifically sized at 235 x 62 x 16 mm for the Fluval U4 and may not fit correctly in smaller models.
No, PolyMax cartridges rely on chemical adsorption. Once the media is saturated, washing will not restore its ability to remove nitrates or phosphates.
Yes, for optimal filtration performance, it is recommended to replace both components every 4 weeks.
A quick rinse in a bucket of aquarium water is recommended to remove loose particles from the foam before placing it back into the filter.
No, these cartridges are designed to remove excess nutrients that cause algae, which generally supports a healthier environment for your plants.
Check that the foam sponge is seated correctly in the housing and not blocking the intake ports.
Ensure that the filter is not being overfed and that lighting duration is limited; the chemical media needs time to adsorb excess nutrients.
To install these replacements, first unplug the Fluval U4 filter from the power source. Remove the filter housing from the aquarium, open the cover, and pull out the old media stack. Slide the new Finest-Filters sponge into the designated mechanical slot and insert the PolyMax cartridge into the chemical filtration stage.
Maintenance Tips:
