---
product_id: 2858698
title: "U Underwater Filter BioMax"
brand: "fluval"
price: "KD 5.00"
currency: KWD
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.com.kw/products/2858698-u-underwater-filter-biomax
store_origin: KW
region: Kuwait
---

# Works in freshwater & marine tanks Complex pore system for bacteria growth Fits Fluval U2, U3, U4 filters U Underwater Filter BioMax

**Brand:** fluval
**Price:** KD 5.00
**Availability:** ✅ In Stock

## Summary

> 🧪 Elevate your aquarium’s ecosystem with Fluval BioMax — where science meets pristine water clarity!

## Quick Answers

- **What is this?** U Underwater Filter BioMax by fluval
- **How much does it cost?** KD 5.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/2858698-u-underwater-filter-biomax)

## 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

- • **Ammonia & Nitrate Control:** Effectively reduces harmful toxins, promoting a healthier, vibrant aquatic environment your fish will thank you for.
- • **Optimized Bacterial Habitat:** Advanced ceramic bio rings create a thriving environment for beneficial bacteria, ensuring crystal-clear water.
- • **Sustainable Cleaning Routine:** Clean only half the media at a time to preserve essential bacteria colonies and maintain a balanced ecosystem.
- • **Dual Environment Compatibility:** Seamlessly supports both freshwater and marine aquariums, making it versatile for any aquatic setup.
- • **Precision Fit for Fluval U Series:** Specifically engineered to perfectly fit U2, U3, and U4 filters for hassle-free installation and maintenance.

## Overview

Fluval U Underwater Filter BioMax is a ceramic bio media designed exclusively for Fluval U2, U3, and U4 filters. Its complex pore structure fosters beneficial bacteria growth, crucial for reducing ammonia and nitrate levels in both freshwater and marine tanks. By maintaining a balanced bacterial colony, it ensures cleaner, healthier water, supporting vibrant aquatic life. Ideal for professional aquarists seeking reliable, scientifically optimized filtration media.

## Description

Fluval BIOMAX provides an optimal environment for beneficial bacteria growth. The bio rings have a complex pore system creating an optimal environment where beneficial bacteria can thrive. It also reduces and controls ammonia and nitrate. For freshwater and marine environments.For U series filter models: U2,U3,U4

Review: Good Fluval U Bio Media for the underwater filters. Good Price. Largest package volume that I can find for these. - The Fluval U Undewater Filter BioMax works as expected with my Fluval U filters. This is the largest packaging of it that I have seen, so I always buy it here on desertcart because of the price versus getting it at the local fish store. I have desertcart Prime, so I get Free 2-day shipping and I don't have to pay for shipping on my orders which is very nice. If Fluval made these in a larger package volume, I would buy that. Make sure you only remove half your bio media when you clean or make changes in your filter so to make sure you maintain a decent established bacterial content in your tank to maintain a working cycle. Don't wash or clean under the tap, or the chlorinated water will kill off the good bacteria especially on the bio- media you are keeping in the filter. Rinse with tank water if necessary. I definitely recommend these for your Fluval U Underwater Filter. They are the BioMax media that you use with the filter. You can add other things as well into the cartridge chamber like carbon, zeo-carbon or ammonia removers if you need it. Fluval has them available for sale as well, and they are available on desertcart. Fluval Carbon, 100-gram Nylon Bags - 3-Pack Fluval Zeo-Carb, 150 Gram, 3-Pack Nylon Bags Fluval Ammonia Remover, 180-gram Nylon Bags - 3-Pack Make sure you are buying the correct BioMax bio media. These are often mistakenly confused with the larger BioMax Bio Rings which will not work or fit in the Fluval U series underwater filters.
Review: Worth it - They work for my cichlids tank is definately cleaner

## Features

- Replenish only half at one time
- Fits the Fluvial U2, U3 and U4 Filters
- Promotes growth of beneficial bacteria
- Works in freshwater or marine environments

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Fluval |
| Customer Reviews | 4.7 out of 5 stars 3,505 Reviews |
| Item Form | Granules |
| Item Weight | 0.1 Pounds |
| Liquid Volume | 110 Liters |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| UPC | 015561104951 |

## Product Details

- **Brand:** Fluval
- **Item Form:** Granules
- **Item Weight:** 0.1 Pounds
- **Liquid Volume:** 110 Liters
- **Manufacturer:** Rolf C. Hagen (USA) Corp.

## Images

![U Underwater Filter BioMax - Image 1](https://m.media-amazon.com/images/I/818XJ-6cv9L.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Fluval U Bio Media for the underwater filters. Good Price. Largest package volume that I can find for these.
*by B***S on March 5, 2016*

The Fluval U Undewater Filter BioMax works as expected with my Fluval U filters. This is the largest packaging of it that I have seen, so I always buy it here on Amazon because of the price versus getting it at the local fish store. I have Amazon Prime, so I get Free 2-day shipping and I don't have to pay for shipping on my orders which is very nice. If Fluval made these in a larger package volume, I would buy that. Make sure you only remove half your bio media when you clean or make changes in your filter so to make sure you maintain a decent established bacterial content in your tank to maintain a working cycle. Don't wash or clean under the tap, or the chlorinated water will kill off the good bacteria especially on the bio- media you are keeping in the filter. Rinse with tank water if necessary. I definitely recommend these for your Fluval U Underwater Filter. They are the BioMax media that you use with the filter. You can add other things as well into the cartridge chamber like carbon, zeo-carbon or ammonia removers if you need it. Fluval has them available for sale as well, and they are available on Amazon. Fluval Carbon, 100-gram Nylon Bags - 3-Pack Fluval Zeo-Carb, 150 Gram, 3-Pack Nylon Bags Fluval Ammonia Remover, 180-gram Nylon Bags - 3-Pack Make sure you are buying the correct BioMax bio media. These are often mistakenly confused with the larger BioMax Bio Rings which will not work or fit in the Fluval U series underwater filters.

### ⭐⭐⭐⭐⭐ Worth it
*by M***D on April 22, 2025*

They work for my cichlids tank is definately cleaner

### ⭐⭐⭐⭐⭐ Great quality
*by D***. on November 7, 2025*

Great quality, go with the name brand and not off brands. Trust what you’re putting into your tank.

## Frequently Bought Together

- Fluval U Underwater Filter BioMax
- Fluval U4 Bio-Foam Pad, Replacement Underwater Aquarium Filter Media, A488
- Fluval U3 Underwater Filter Foam Pad

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-03-01*