The Fluval FX4 High Performance Canister Filter delivers exceptional mechanical, biological, and chemical filtration for large freshwater and saltwater aquariums up to 250 gallons. Designed for serious hobbyists, the FX4 combines powerful filtration, energy-efficient performance, and easy maintenance into one of the most trusted canister filters on the market.

Powered by Fluval's Smart Pump™ technology, the FX4 continuously monitors filter performance and automatically purges trapped air every 12 hours to maintain maximum efficiency. Its multi-stage filtration system removes debris, supports beneficial bacteria, and keeps aquarium water crystal clear while reducing maintenance.

With an impressive 700 GPH output and large-capacity media baskets, the FX4 is ideal for heavily stocked aquariums, predator tanks, cichlid tanks, turtle habitats, large freshwater aquariums, and fish-only marine systems.

Whether you're upgrading your filtration or setting up a new display aquarium, the Fluval FX4 provides reliable performance trusted by aquarists worldwide.

Features

• Suitable for aquariums up to 250 gallons
• Powerful 700 GPH flow rate
• Multi-stage mechanical, biological, and chemical filtration
• Smart Pump™ technology monitors performance
• Automatic self-starting system
• Automatically purges trapped air every 12 hours
• Large-capacity media baskets
• Energy-efficient operation
• AquaStop valves for quick maintenance
• Easy water changes and servicing
• Quiet, dependable performance
• Freshwater and saltwater compatible

Specifications

• Aquarium Size: Up to 250 Gallons
• Flow Rate: 700 GPH
• Filtration: Mechanical, Biological & Chemical
• Power: Smart Pump™ Technology
• Application: Freshwater & Saltwater Aquariums

Perfect For

• Predator Aquariums
• African Cichlid Tanks
• Community Aquariums
• Turtle Aquariums
• Large Freshwater Aquariums
• Fish-Only Saltwater Systems
• Heavily Stocked Aquariums

Why Choose the Fluval FX4?

The Fluval FX4 has earned its reputation as one of the industry's most dependable canister filters. Its large media capacity, intelligent pump technology, and simple maintenance make it an excellent choice for hobbyists who need powerful filtration without sacrificing reliability.

Whether you're maintaining crystal-clear water in a predator tank or supporting a heavily stocked freshwater aquarium, the FX4 delivers the performance needed to keep your aquatic environment healthy.

Why Shop with Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we carefully select aquarium equipment known for its quality, reliability, and long-term performance. Whether you're upgrading an existing system or building a new aquarium, we're committed to providing trusted products backed by exceptional customer service.

When you shop with us, you'll receive:

• Genuine manufacturer-authorized products
• Competitive everyday pricing
• Family-owned small business service
• Secure online checkout
• Carefully packaged orders
• Knowledgeable hobbyist support

Shipping Information

Orders are typically processed within 1–3 business days before shipment.

Once your order ships, you'll receive a tracking email so you can follow your package every step of the way. Most orders arrive within 3–7 business days, depending on your location and carrier transit times.

Some manufacturer direct-ship or special-order items may require additional processing time. If applicable, any extended lead times will always be noted on the product page before purchase.