---
product_id: 2221474
title: "Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239"
brand: "fluval"
price: "S$48"
currency: SGD
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.sg/products/2221474-fluval-fx4-fx5-fx6-bio-foam-replacement-aquarium-filter-media
store_origin: SG
region: Singapore
---

# Dual mechanical & biological filtration Reusable & easy to rinse Dense porous foam structure Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239

**Brand:** fluval
**Price:** S$48
**Availability:** ✅ In Stock

## Summary

> 🧼 Elevate your aquarium’s clarity game — because your fish deserve the best!

## Quick Answers

- **What is this?** Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239 by fluval
- **How much does it cost?** S$48 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/2221474-fluval-fx4-fx5-fx6-bio-foam-replacement-aquarium-filter-media)

## Best For

- fluval enthusiasts

## Why This Product

- Trusted fluval brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Reusable:** High-quality foam holds shape and rinses clean for long-lasting performance and cost efficiency.
- • **Trusted by Aquarists:** Top-rated filter media with proven reliability in heavily stocked freshwater and saltwater tanks.
- • **Double Duty Filtration:** Combines mechanical debris trapping with biological nitrification for crystal-clear water.
- • **Maximized Surface Area:** Intricate porous network boosts beneficial bacteria growth to maintain a healthy aquatic ecosystem.
- • **Precision Fit for Fluval FX Series:** Specifically engineered for FX4, FX5, and FX6 canister filters ensuring seamless installation.

## Overview

Fluval FX4/FX5/FX6 Bio-Foam replacement filters deliver superior dual mechanical and biological filtration with a dense, porous design that traps fine particles and fosters beneficial bacteria growth. Designed exclusively for Fluval FX series canister filters, these durable, reusable foam inserts ensure pristine water quality in both freshwater and saltwater aquariums, making them a must-have for serious aquarists seeking effortless, reliable tank maintenance.

## Description

Fluval Bio-Foam performs double duty as both an effective mechanical and biological media. It is specifically designed for use in Fluval FX4, FX5 and FX6 High Performance Canister Filters. Bio-Foam provides outstanding mechanical and biological filtration thanks to an intricate pore structure that offers a large surface area for nitrifying biological activity. In addition, it trap small particles that are not retained by the first stage of foam filtration.For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

Review: Fits Perfectly and Works Well - These bio-foam inserts fit exactly as expected and have been working without any issues. The foam is well made, holds its shape, and is easy to rinse and reuse. They’ve been a reliable replacement option and perform just as they should. No mess, no fuss, and no complaints. Simple, effective, and dependable.
Review: Best pads really polish, traps lot of debris, buy in bulk and use desertcart shop/save for 5 to 15% off - Well if you have seen any of my review's about Fluval or Seachem product's, you undoubtedly will come to a conclusion that I only use these 2 product's & I buy in bulk for the best price. Why? Because they work plane and simple, I have seen the off brands at great price's and even gave them a shot, while the off brand does a good job, I found that at least in my setups (multiple very large tanks and heavenly stocked Cichlids African and SA/CAs which are very very large and messy fish) the off brands clogged up a bit faster. I am a fantic when it comes to maintaining my tanks. I run a total of 5 Fluval FX6 filters (2 in my African 135 and 3 in my 220 CA/SA along with 3 Fluval FX4 in my other 3 tanks from 30 to 90 gallon) These polishing pads really trap and polish the water combined with The Blue Fluval pads and water is crystal clear giving the illusion my fish are floating on mid air. These filter pads work in many other canister filters as well with very little effort. Bottom line if you run any of the Fluval FX series these pads are a must and ate worth every penny!

## Features

- Replacement Filtration: Bio-Foam filter inserts are designed for use in Fluval FX4, FX5 and FX6 Canister Filters in freshwater and saltwater aquariums.
- Double Duty: These Bio-Foam filters perform as both mechanical and biological filters.
- Intricate Design: Bio-Foam’s dense structure is ideal for trapping small particles, with an intricate, porous network that provides vast surface area to facilitate biological activity.
- Maintain Clean Environment: Proper filtration helps create clean and healthy water conditions.
- Pack Includes: Each package contains two replacement Bio-Foam filters.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00D6DRSK8 |
| ASIN  | B00D6DRSK8 |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #8,779 in Pet Supplies ( See Top 100 in Pet Supplies ) #56 in Aquarium Filter Accessories |
| Brand Name | Fluval |
| Breed Recommendation | Large Breeds, Small Breeds |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,341) |
| Date First Available | June 4, 2013 |
| Date First Available  | June 4, 2013 |
| Department | Filter Media |
| Department  | Filter Media |
| Directions | Follow individual packaging instructions. |
| Included Components | All Items listed in Description |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 2.5 x 7.7 x 9.1 inches |
| Item Package Dimensions L x W x H | 8.98 x 7.72 x 2.44 inches |
| Item Weight | 0.18 Pounds |
| Item model number | A239 |
| Item model number  | A239 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Material | Foam |
| Model Name | HAGEN FLUVAL FX5/6 BIO-FOAM |
| Number of Items | 1 |
| Product Dimensions  | 2.5 x 7.7 x 9.1 inches; 2.88 ounces |
| Size | 1 Count (Pack of 1) |
| Specific Uses for Product | Indoor |
| Style | Bio-Foam |
| Target Audience Keyword | algae-eaters, betta-fish, bottom-feeder-fish, cichlid-fish, fish, goldfish, invertebrate-fish, mollusks, octopuses, rays, sharks, snails |
| Warranty Description | Manufacturer Warranty |

## Images

![Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239 - Image 1](https://m.media-amazon.com/images/I/71JDj1J5qgL.jpg)

## Questions & Answers

**Q: How frequent this should be changed? since its carbon impregnated.**
A: Fluval says once a month... To me It all really depends on water change regime.

**Q: Will these work in the FX4 or are they a different size?**
A: Yes. It will fit your FX4.

**Q: Do these also fit the fluval fx4?**
A: Every single part/pad etc made for FX4/5/6 are interchangeable with the exception of the pump motor for FX4. Everything else and I mean everything else fits all FX series.

**Q: Can this be used for preparation for an Axolotl? And if so, is it recommended?**
A: I am not sure.  Using it helps in toxic ammonia.  Your critter lives in murky, muddy water I believe.  Ammonia can build up anywhere.  You might get contact your pet store.  Sorry

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fits Perfectly and Works Well
*by K***T on January 11, 2026*

These bio-foam inserts fit exactly as expected and have been working without any issues. The foam is well made, holds its shape, and is easy to rinse and reuse. They’ve been a reliable replacement option and perform just as they should. No mess, no fuss, and no complaints. Simple, effective, and dependable.

### ⭐⭐⭐⭐⭐ Best pads really polish, traps lot of debris, buy in bulk and use Amazon shop/save for 5 to 15% off
*by J***N on June 15, 2019*

Well if you have seen any of my review's about Fluval or Seachem product's, you undoubtedly will come to a conclusion that I only use these 2 product's & I buy in bulk for the best price. Why? Because they work plane and simple, I have seen the off brands at great price's and even gave them a shot, while the off brand does a good job, I found that at least in my setups (multiple very large tanks and heavenly stocked Cichlids African and SA/CAs which are very very large and messy fish) the off brands clogged up a bit faster. I am a fantic when it comes to maintaining my tanks. I run a total of 5 Fluval FX6 filters (2 in my African 135 and 3 in my 220 CA/SA along with 3 Fluval FX4 in my other 3 tanks from 30 to 90 gallon) These polishing pads really trap and polish the water combined with The Blue Fluval pads and water is crystal clear giving the illusion my fish are floating on mid air. These filter pads work in many other canister filters as well with very little effort. Bottom line if you run any of the Fluval FX series these pads are a must and ate worth every penny!

### ⭐⭐⭐⭐⭐ Filter pads
*by F***Z on September 18, 2025*

Great filters were great. Water is crystal clear

## Frequently Bought Together

- Fluval FX4/FX5/FX6 Bio-Foam, Replacement Aquarium Filter Media, 2-Pack, A239
- Fluval Carbon Filter Media for Aquariums, Premium Bituminous Carbon Inserts, 100-gram Nylon Bags, 3 Count (Pack of 1), A1440
- Hagen FL FX4/6 Phosphate Remover PAD 3PK

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-24*