# Filter Sponge Cartridge Hagen Fluval U3 010581 – Replacement Media for Fluval U3 Internal Filter

**URL:** https://aio.lv/en/product--hagen-010581--12069364
**Data updated:** 2026-03-12 21:48 (EET)
**Category:** Aquarium Supplies
**Manufacturer:** Hagen
**Manufacturer code:** 010581
**EAN:** 015561104876
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 6.49 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 5.36 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hagen-010581--12069364

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Replacement sponge cartridge for Hagen Fluval U3 internal aquarium filter (MPN 010581). Provides mechanical and biological filtration as part of the Fluval U3 filter media stack. Designed to fit the Fluval U3 unit for routine maintenance and media replacement. Suitable for freshwater and typical home aquarium use to trap debris and support beneficial bacteria.

## Long description

The Hagen Fluval U3 Filter Sponge Cartridge is a replacement media element designed to restore the filtration performance of the Fluval U3 internal aquarium filter. This sponge cartridge provides mechanical trapping of debris and a porous surface that supports biological filtration within the Fluval U3 media stack. It is shaped to fit the Fluval U3 housing and intended for routine media replacement during regular aquarium maintenance for freshwater and typical home aquarium setups.
Advantages
This replacement sponge cartridge combines dense mechanical filtration with an open-cell structure suitable for colonization by nitrifying bacteria, helping maintain water clarity and biological stability. The cartridge is pre-cut and sized for straightforward installation into the Fluval U3 filter, reducing handling and fitting time. Because it is designed specifically for the Fluval U3, it aligns with the original filter flow path and media arrangement to preserve intended performance.
Suitable for
 Routine maintenance and media replacement in Fluval U3 internal filters
 Freshwater home aquariums
 Systems that require mechanical removal of suspended debris and support of beneficial bacteria
Key specifications
 Media type: foam sponge providing mechanical and biological filtration
 Compatibility: shaped to fit Fluval U3 internal filter media compartment
 Function: traps particulate waste and offers surface area for bacterial colonisation
 Intended environment: freshwater aquaria and typical home aquarium conditions
How to use
Turn off and unplug the Fluval U3 filter and remove the media basket according to the filter manufacturer’s instructions. Remove the used sponge cartridge and rinse the media basket with aquarium water if necessary to avoid killing beneficial bacteria. Insert the replacement sponge cartridge into the same position within the media compartment, ensuring it sits securely and aligns with other media. Reassemble the filter and restore power, then check for correct water flow and any unusual noise or vibration after restart.
Usage recommendations
Inspect the sponge cartridge regularly and replace it during scheduled filter maintenance or when significant clogging or deterioration is observed. When cleaning, rinse gently in removed aquarium water rather than tap water to preserve beneficial bacterial colonies. Replace according to aquarium bioload and manufacturer's guidance to maintain reliable mechanical and biological filtration.

## FAQ

### How much does the Hagen Fluval U3 Filter Sponge Cartridge 010581 cost, and is it available for purchase?

The price is 6.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 11 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Hagen products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Hagen service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12069364/67554314_large.webp