Keep your Fluval aquarium filtration system performing effectively with a genuine Fluval Flex Replacement Foam Filter Block.

The black foam filter block forms an important part of the Fluval Flex filtration system, helping to capture larger particles and debris from the aquarium water before they can continue through the filtration system.

Available in sizes to suit the Fluval Flex 34 litre, 57 litre and 123 litre aquariums, simply select the correct model for your aquarium from the options above.

Key Features

• Genuine Fluval replacement filter foam
• Designed for Fluval Flex aquarium filtration systems
• Helps trap larger particles and aquarium debris
• Provides effective mechanical filtration
• Helps protect subsequent filtration stages from excessive debris
• Durable foam construction
• Easy to remove for routine filter maintenance
• Available for Fluval Flex 34L, 57L and 123L aquariums
• Direct replacement for the original Fluval foam filter block

Available Sizes & Compatibility

Select the replacement foam that matches your Fluval Flex aquarium:

• Fluval Flex 34 Litre Fluval Part Number A1376
• Fluval Flex 57 Litre Fluval Part Number A1375
• Fluval Flex 123 Litre Fluval Part Number A1375

These are the part numbers currently listed against the three variants on your product page.

Mechanical Filtration for Your Fluval Flex

The replacement foam filter block provides an important stage of filtration within the Fluval Flex aquarium.

As aquarium water passes through the foam, larger suspended particles and debris are trapped within its structure. This helps prevent excessive solid waste from progressing further through the filtration system.

Regular maintenance of the foam helps maintain good water flow and keeps the integrated Fluval Flex filtration system operating efficiently.

Genuine Fluval Replacement Media

Using the correct genuine Fluval replacement foam ensures the filter block is properly suited to the filtration compartment of the compatible Fluval Flex aquarium.

Rather than replacing the complete filtration system when the original foam becomes worn or requir