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FX4 External Filter (Freshwater) Upgrade Kit
FX4 External Filter (Freshwater) Upgrade Kit FX4 External Filter (Freshwater) Upgrade Kit FX4 External Filter (Freshwater) Upgrade Kit FX4 External Filter (Freshwater) Upgrade Kit

FX4 External Filter (Freshwater) Upgrade Kit

£61.99



Kit suitable for Fluval FX4 canister filters
This kit contains 3kg of Biohome Ultimate, 1 set of coarse, medium and fine foams, 2 extra strips of foam (1 x coarse, 1 x medium) plus lots of gel filter starter balls to seed the filter with beneficial bacteria and prevent any ammonia or nitrite spikes if this kit is used to replace media in a mature system. If the kit is used for a mature system it is best to swap out old media gradually (over a month or so) to make the transition as smooth as possible. Once the new media matures in the filter it should last 6-10 years at high efficiency. 
Foams for outer parts of trays should be cut to 37.5cm (14.75") x 9cm (3.5"). You will be able to cut 3 foams from each 17" x 11" coarse and medium foam so as this kit has 1 set of foams that allows for 3 x half sections of outer foams with the strips of foam completing the foam section in last tray to ensure there is enough foams for both trays of the FX4.
The fine pads can be carefully ripped to a suitable thickness then cut to size for the top tray - you only need one fine pad on top of the top tray.
This video explains the full process of upgrading an FX6 and also applies to an FX5 / FX4:
HOW TO UPGRADE AN FX6 / FX5



Customer Reviews
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Reviewer: Jason Reading   5 Stars
Made an amazing difference to my tank. Water is clearer between weekly water changes. Less algae on the glass and fish are more active. Would recommend for anyone with this filter unit as so much better than what you get in the box.