Keep your Fluval U Series underwater filter performing effectively with this complete replacement media pack. Combining mechanical, chemical and biological filtration, the set provides all three essential filtration stages to help maintain clean, clear and healthy aquarium water.

Suitable for Fluval U2, U3 & U4 underwater filters.

Pack Includes

• Fluval Foam Filter Media
• Fluval Poly/Carbon Cartridges – Pack of 2
• Fluval Biomax – 110g

Stage 1 – Foam
Provides essential mechanical filtration, capturing larger particles and debris before they reach the other filter media. The foam is designed to fit securely inside the filter chamber, helping prevent debris bypass while maintaining efficient water flow.

Stage 2 – Poly/Carbon
The dual-sided cartridges provide effective chemical and fine mechanical filtration. The polyester side captures fine debris and contaminants, while the activated carbon side helps remove unwanted substances, discolouration and odours.
Contains 2 Poly/Carbon cartridges.

Stage 3 – Biomax 110g
Fluval Biomax provides biological filtration through its highly porous bio rings. The large surface area creates an ideal environment for beneficial bacteria to colonise, helping process fish waste and maintain a healthy biological balance.

Key Features

• Complete media pack for Fluval U2, U3 & U4 filters
• Includes Foam, Poly/Carbon & 110g Biomax
• Provides all 3 stages of filtration
• Captures large and fine debris
• Helps remove odours and discolouration
• Supports beneficial bacteria
• Promotes efficient water flow
• Helps maintain clean, clear aquarium water
• Suitable for freshwater and marine aquariums

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Klarna's credit products are provided by Klarna Bank AB, which is authorised and regulated by the Swedish Financial Services Authority, with limited supervision by the Financial Conduct Authority. More information can be found here.

Newpay finance options are provided through Deko’s platform by NewDay. P.D. Aquatics Ltd, t/a Aquacadabra is an Introducer Appointed Representative of Pay4Later Ltd, t/a Deko, which is authorised and regulated by the Financial Conduct Authority (ref no 728646) and is a credit broker, not a lender. NewDay Ltd is authorised and regulated by the Financial Conduct Authority (ref no 690292) and is authorised by the Financial Conduct Authority under the Payment Services Regulations 2017 for the provision of payment services (ref no 555318). More information can be found by clicking the newpay option above, or in the Newpay FAQs.

We really want you to be happy with the product that you've received. If however, when the goods arrive they're not what you want, then no problem - we have a 60 day no quibble return guarantee. Just let us know that you're going to return the item(s) by contacting us(stating your Order Number) and complete the returns packing slip that will have been included with your delivery. This will help us to quickly identify the item that you have returned (unopened and unused) - and we'll put a refund through for you.