The store will not work correctly in the case when cookies are disabled.
Bulk Reef Supply Saltwater Logo
Bulk Reef Supply Freshwater Logo

FREE Shipping Over $49

Free Shipping

Orders Over $49 Ship Free

$5.99 economy shipping on orders under $49

Learn More
| Earn Reward Points
Skip to Content
Menu BRS Freshwater
My Cart
    • My Account
    • My Wish List
    • My Orders
    • Address Book
    • Sign Out
    • Reward Points
  • Sign In
Bulk Reef Supply Mobile Menu
Close

Quick Links

  • Deals
  • Gift Cards
  • What's New
  • Education
  • Clearance
  • Open Box
  • PR Rewards
  • Shop Brands
  • FAQs
  • Saltwater
Menu
Fast Shipping Fast Shipping
Sign up to be a Reward Member Earn Reward Points
Returns 365-Day Returns
Experts Aquarium Experts
  • Fast Shipping Fast Shipping
  • Sign up to be a Reward Member Earn Reward Points
  • Returns Risk-Free 365 Day Returns
  • Experts Aquarium Experts
Loading...
Fluval

Fluval FX4 Canister Filter

In stock
Out of stock
SKU
252681
Be the first to review this product
$309.99 $309.99

- +
Add to Wish List
Risk Free 365 Returns

Your Satisfaction Guaranteed With
365 Day Risk Free Returns

No longer need what you ordered? Ordered one too many? We've got your back.


Return new, unopened products in original packaging within 365 days for a full refund.

Under 60 days? No problem. We’ll issue your refund to the original form of payment. Over 60 days? Still no problem. We'll issue your refund in the form of store credit, which you can use like cash on our website.


Return unused, open box products within 30 days.

Open box but still unused? We can help. We’ll issue your refund to the original form of payment minus a small 10% restocking and handling fee.

Some exclusions apply, for more information go to Return & Replacement Details.

Skip to the end of the images gallery
main product photo
Skip to the beginning of the images gallery
Details

Fluval FX Series of High-Performance Canister Filters

  • For aquariums up to 250 gallons
  • Multi-Stage filtration
  • Large 1-gallon media capacity
  • All filter media is included
  • Self-starting - just add water & plug in
  • Aqua-Stop valves with leak-proof Click-Fit attachment

 

Canister filters have long been used on freshwater aquariums, but canister filters deserve a second look for saltwater aquariums and reef tanks too. If you're not familiar with canister filters, they're a closed container filled with filter media and a pump built-in to pull water from the aquarium, move it through the media, and push it back into the aquarium. Think of it as a media reactor with a built-in pump. Whether you use a canister filter for your main filtration, as a media reactor, or even as an occasional water polishing device, reefers should absolutely be taking a look at Fluval's canister filter lineup. 

Recognized as the “workhorse of canisters” for their legendary strength and durability, high output FX Series filters sweep the tank harder and faster to retain a greater amount of debris. Combining SMART PUMP performance-optimizing technology with auto start/stop operation and intricate multi-stage cleaning featuring an expansive basket-in-basket media tray design, FX owners will spend more time enjoying their aquarium, and less time maintaining it.

 

Multi-Stage Filtration

FX Series filters feature 2 inset red baskets for greater media capacity and flexibility. As with all Fluval filters, water flows through each media stage in proper order to ensure thorough cleaning. This process is more efficient and effective than forcing water through all stages in one pass.

 

Seamless Water Change

The FX4 and FX6 filters feature a multi-functional utility valve to empty the canister and perform seamless water changes without disturbing your setup or tank inhabitants. As an added bonus, two convenient hosing clips located on the filter lid allow for storage when not in use.

 

Free Media Included

Bio-Foam (x4): Traps waste and debris

Bio-Foam+ (x1): Boosts beneficial bacteria growth

BIOMAX (x2): Porous rings for biological filtration & promote beneficial bacteria growth

Carbon Foam Pad (x1): Traps micro particles and debris while removing odors, discolorations, heavy metals and organic contaminants

Media Bags (x2)

 

 

FX4 Specifications:

Recommended aquarium size: Up to 250 gallons

Flow Rate: 700 GPH

Dimensions: 15.75" L x 15.75" W x 16.5" H

Canister Volume: 3.7 gallons (holds 1 gallon worth of media)

Max Head Pressure: 6.9 feet

Wattage: 30W

 

What's Included?

Rubber hose

Rim connectors, clips, and suction cups

Intake stem

Output nozzle

Lid fasteners

Filter canister

Utility valve and hosing

Drain cap

Pump unit (motor) and power cord

Rubber feet

Media baskets

1/2 media baskets

Filter lid and accessories

 

More Information
More Information
SKU 252681
UPC 015561102148
Instruction Manual Fluval FX Series Canister Filter Manual
Aquarium Type Saltwater, Freshwater
Reviews
Write Your Own Review
You're reviewing:Fluval FX4 Canister Filter
Your Rating
Product Questions

Product Questions

No questions yet. Be the first to ask the question!

SIGN UP FOR THE BULK REEF SUPPLY NEWSLETTER

Don’t be the last to know this holiday season about sales, specials, new products, and more!

Sign Up Now
BRS Fresh https://media2.cdn.bulkreefsupply.com/media/logo/stores/1/BRS-Logo-498x174.png https://fresh.bulkreefsupply.com/
BRS Fresh Bulk Reef Supply
  • Facebook Opens a new window
  • Youtube Opens a new window
  • Instagram Opens a new window
  • TikTok Opens a new window

Contact

  • 763-432-9691

  • 8am - 6pm CT M-Th
    9am - 4pm CT Friday
  • support@bulkreefsupply.com
  • 6325 Sandburg Road, Suite 200
    Golden Valley, MN 55427 US

Bulk Reef Supply
About Us
Customer Service
Careers
Wholesale Customers
Instructions
Terms & Conditions
Customer Center
Preferred Reefer Program
International Shipping
Returns & Replacements
Payment, Pricing & Promos
Shipping & Delivery
APL Star Logo
© 2025 Aperture Pet & Life. All Rights Reserved.
Privacy Policy

item(s) Added to Your Cart

Product Name

View Cart Checkout Now
You may also like
Filter Sponge for Waterbox AIO 10C/15P - Waterbox
Waterbox Aquariums
Filter Sponge for Waterbox AIO 10C/15P - Waterbox
$7.99 $7.99

BRS Bulk Bituminous Aquarium Carbon
Bulk Reef Supply
BRS Bulk Bituminous Aquarium Carbon
Rating:
93%
19 Reviews
From: $10.99

Choose Options
Bio-Foam Max for Fluval 06 & 07 Series Canister Filters
Fluval
Bio-Foam Max for Fluval 06 & 07 Series Canister Filters
From: $4.99

Choose Options
FX4/FX5/FX6 Bio Foam (3 Pack)
Fluval
FX4/FX5/FX6 Bio Foam (3 Pack)
$33.99 $33.99

Shark PRO Hyperbio Pearl Cartridge with Sponges
Sicce
Shark PRO Hyperbio Pearl Cartridge with Sponges
$12.99 $12.99

MicroBacter Lattice Large - Biological Filtration Media
Brightwell Aquatics
MicroBacter Lattice Large - Biological Filtration Media
$14.41 $14.41

AF Anti Phosphate Freshwater (1000 mL Bag)
Aquaforest
AF Anti Phosphate Freshwater (1000 mL Bag)
$24.79 $24.79

Aquamesh Black 1 - Extra Coarse - Lifegard
Lifegard Aquatics
Aquamesh Black 1 - Extra Coarse - Lifegard
$33.99 $33.99

Nano-Tech Bio-Blocks (2 pcs)
Maxspect
Nano-Tech Bio-Blocks (2 pcs)
$17.99 $17.99

Poly Filter Aquarium Filter
Poly-Bio-Marine Inc
Poly Filter Aquarium Filter
From: $7.99

Choose Options

Login and Registration Form

  • Login
  • Register

Registered Customers
If you have an account, sign in with your email address.
Forgot Your Password?
or

Login with Your Social Profile Login with
Continue with Google
Continue with Facebook
Continue with Apple

Personal Information
Sign-in Information
Password Strength: No Password
Back
or

Login with Your Social Profile Login with
Continue with Google
Continue with Facebook
Continue with Apple
  • Forgot Your Password?

Please enter your email address below to receive a password reset link.
Go back