---
product_id: 47963213
title: "Fluval FX4 External Filter"
brand: "fluval"
price: "€ 970.06"
currency: EUR
in_stock: null
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.hr/products/47963213-fluval-fx4-external-filter
store_origin: HR
region: Croatia
---

# 2650L/hr flow rate Smart Pump microchip tech All-in-one filter media included Fluval FX4 External Filter

**Brand:** fluval
**Price:** € 970.06
**Availability:** ❌ Out of Stock

## Summary

> 💧 Elevate your aquarium game with the Fluval FX4 – where power meets precision!

## Quick Answers

- **What is this?** Fluval FX4 External Filter by fluval
- **How much does it cost?** € 970.06 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/47963213-fluval-fx4-external-filter)

## 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

- • **Smart Pump Technology:** Advanced microchip optimizes performance for efficiency and longevity.
- • **Massive 1000L Capacity:** Perfect for large freshwater and marine tanks, supporting your aquatic ecosystem.
- • **Powerful 2650L/hr Flow:** Keeps your aquarium crystal clear with rapid water turnover.
- • **Complete Filtration System:** Mechanical, chemical, and biological media included for total water purity.
- • **Easy Maintenance & Water Changes:** Built-in drain tap simplifies water changes, saving you time and hassle.

## Overview

The Fluval FX4 External Filter is a high-capacity filtration system designed for aquariums up to 1000 liters. It pumps 2650 liters of water per hour through a multi-stage filtration process including mechanical, chemical, and biological media—all included. Featuring Smart Pump technology, it continuously monitors and optimizes performance for reliable, efficient operation. Suitable for both freshwater and marine tanks, it also offers convenient maintenance with an integrated drain tap, making water changes effortless. Ideal for serious aquarium enthusiasts seeking powerful, all-in-one filtration.

## Description

Free delivery and returns on eligible orders. Buy Fluval FX4 External Filter, 1000 Litre at desertcart UK.

Review: Good value and price. - Good product, good price and fast delivery.
Review: Excellent - This filter is superb. I have it running on a Fluval Roma 240 tank. Which originally came with the Fluval 306. A good filter in its own right, but this is the next level. It’s really easy to maintain and due to its size and filtration ability I only clean mine out once very 5-6 months, where as with the 306, this I had to clean almost weekly. The intake and output can both be independently adjusted, so you can reduce the flow if it’s really stirring up your tank. It came with filter media and having had this running for well over 5 years now, I still have the original media in place and have no need to replace it any time soon. Mine came with a free gravel vac, although this was more of a novelty than a bonus. I just use a normal gravel vac as part of my water changes so the one included isn’t of any use as the water stays within the system. After years of constantly being on, it has been faultless but quiet it is not. There is a continuous humming noise coming from it and if the tank was in a bedroom you would not want the filter running. Keep this in mind before you buy as it is not silent. Our tank is in the living room and the filter sits in a cabinet, but it’s still quite loud, butit doesn’t bother us, however if it we’re silent running it would be an amazing and faultless filter. It includes a small tap that allows you to drain out water direct from the filter, this makes water changes incredibly easy. However, if you’re filling the tank back up you need to ensure it’s dechlorinated water so as not to harm the fish or filter bacteria. Other than the noise, I really can’t complain about the filter at all and would highly recommend it. If you cover your filter Inlet with pond filter sponge, you can protect fish and shrimp from being sucked in and prolong the gap between cleaning the filter out. Which is what I do and it works wonders.

## Features

- Suitable for aquariums up to 1000L
- Multi-stage filter pumps out 2650L of water per hour
- "Smart Pump" advanced microchip technology monitors & optimises pump performance
- All filter media included (mechanical, chemical & biological)
- Suitable for freshwater and marine aquariums

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00N45GLZQ |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 11,893 in Pet Supplies ( See Top 100 in Pet Supplies ) 55 in Aquarium Filters |
| Colour | Black |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,362) |
| Date First Available | 17 July 2016 |
| Item Weight | 6.43 kg |
| Item model number | A214 |
| Outer Material | Plastic |
| Product Dimensions | 39.62 x 39.62 x 44.96 cm; 6.43 kg |
| Quantity | 1 |
| Size | 1000L |

## Product Details

- **Brand:** Fluval
- **Colour:** Black
- **Global Trade Identification Number:** 00015561102148
- **Item weight:** 6.43 Kilograms
- **Manufacturer:** Hagen
- **Material:** Plastic
- **Maximum flow rate:** 2650 Litres Per Hour
- **Power source:** Corded Electric
- **Product dimensions:** 39.6L x 39.6W x 39.6H centimetres
- **Style:** Canister

## Images

![Fluval FX4 External Filter - Image 1](https://m.media-amazon.com/images/I/71kUpnbpTOL.jpg)
![Fluval FX4 External Filter - Image 2](https://m.media-amazon.com/images/I/81-g3azkCyL.jpg)
![Fluval FX4 External Filter - Image 3](https://m.media-amazon.com/images/I/710ZcYFglLL.jpg)
![Fluval FX4 External Filter - Image 4](https://m.media-amazon.com/images/I/71RKE2QdFxL.jpg)
![Fluval FX4 External Filter - Image 5](https://m.media-amazon.com/images/I/81SRBWXbMCL.jpg)

## Available Options

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

## Questions & Answers

**Q: Would it be to much for a 105l planted aquarium**
A: I have an FX6 on my Fluval Roma 240  and I use a 306 on my 125litre tank.
You can't really have too much filtration.  So if the FX4 fits why not. You can adjust the flow down if you need to anyway.

**Q: Will the inlet & outlet pipes fit in my jewel rio 240 rear grooves without me having to cut the grooves to make them fit. Hopefully you know what i me**
A: I want to know the answer to this question too, as I’m tossing up between 2x 307’s or an FX4

**Q: The strainer looks big, how to stop fry from bekng sucked in?**
A: i use a bit of very fine net over the strainer

**Q: is this ok for small fish such as tetras ,i also have angels  is it quiet and  how  thick r the hoses**
A: You can adjust both intake and out flow rates. So if you’re fish are getting battered you can turn it down. I have Neon tetra among the inhabitants of the tank I have this running on, they’re fine. They don’t shy from it. I think with angels being so flat sided they might struggle though, unless you reduce the flow.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good value and price.
*by M***. on 9 January 2026*

Good product, good price and fast delivery.

### ⭐⭐⭐⭐⭐ Excellent
*by D***Y on 21 December 2017*

This filter is superb. I have it running on a Fluval Roma 240 tank. Which originally came with the Fluval 306. A good filter in its own right, but this is the next level. It’s really easy to maintain and due to its size and filtration ability I only clean mine out once very 5-6 months, where as with the 306, this I had to clean almost weekly. The intake and output can both be independently adjusted, so you can reduce the flow if it’s really stirring up your tank. It came with filter media and having had this running for well over 5 years now, I still have the original media in place and have no need to replace it any time soon. Mine came with a free gravel vac, although this was more of a novelty than a bonus. I just use a normal gravel vac as part of my water changes so the one included isn’t of any use as the water stays within the system. After years of constantly being on, it has been faultless but quiet it is not. There is a continuous humming noise coming from it and if the tank was in a bedroom you would not want the filter running. Keep this in mind before you buy as it is not silent. Our tank is in the living room and the filter sits in a cabinet, but it’s still quite loud, butit doesn’t bother us, however if it we’re silent running it would be an amazing and faultless filter. It includes a small tap that allows you to drain out water direct from the filter, this makes water changes incredibly easy. However, if you’re filling the tank back up you need to ensure it’s dechlorinated water so as not to harm the fish or filter bacteria. Other than the noise, I really can’t complain about the filter at all and would highly recommend it. If you cover your filter Inlet with pond filter sponge, you can protect fish and shrimp from being sucked in and prolong the gap between cleaning the filter out. Which is what I do and it works wonders.

### ⭐⭐⭐⭐⭐ Excellent Filter
*by D***T on 31 March 2020*

I purchased this filter for use with my daughters Christmas present a 250 litre fish tank. The main reason I purchased this was because it helps with water changes. My daughter is 12 and I didn't want her interest in fish keeping to become a chore. It hasn't. With the turn of two valves the filter will empty water out of the tank. And with the addition of a length of hose and a nearby downstairs toilet and the smart use of some Hozelock dual control valves the entire process of emptying and filling is now done without buckets. There is in my opinion some serious downside with this filter. It doesn't come with anywhere near enough medium. However, if you're prepared to invest in a seriously great media product I'd recommend Biohome Ultimate. I've added a canister filter to the in-line side of the filter. This is simply a mechanical filter. I've removed the mechanical filters from the bottom of the FX4 and used the entire bottom of the filter to house 3kg of Biohome. And I now have nitrates that appear at between 1 & 3ppm. Apart from that sadly missed opportunity by Fluval this is an excellent filter. It's robust and sturdy. It's quiet. If you want to understand how to "pimp" this filter I'd suggest you go to You Tube and search for "pimp my filter" by Pond Guru. I've no affiliation with Fluval, Biohome or Pond Guru. I don't leave many reviews on Amazon. I genuinely hope this is one that offers some help for others.

## Frequently Bought Together

- Fluval FX4 High Performance Canister Aquarium Filter - Multi-Stage Filtration, Built-In Powered Water Change System, and Basket-In-Basket Tray Design
- Fluval FX Spray Bar Kit, Aquarium Filter Water Aeration Accessory
- Fluval E 300 Watt Electronic Heater

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-02*