Crystal-Clear Water Starts with the Right Filter Media

Give your fish the cleanest, healthiest environment possible with these Aquarium Filter Media Hollow Balls. Available in 100G, 200G, and 500G options, these bio-filter balls are engineered to maximize beneficial bacteria colonization — the cornerstone of a thriving aquatic ecosystem. Whether you keep a freshwater community tank, a tropical fish setup, or a large koi pond, these hollow balls deliver outstanding mechanical and biological filtration.

Made in Mainland China.

Why Hollow Bio-Filter Balls?

The unique hollow-ball design dramatically increases surface area compared to flat or solid media. More surface area means more room for nitrifying bacteria to grow — the beneficial microbes that convert toxic ammonia and nitrite into harmless nitrate, keeping your water parameters safe and stable for your fish.

🐠 Suitable for All Aquariums: Works in freshwater tanks, saltwater reef tanks, tropical fish setups, and outdoor koi ponds.
🔬 Superior Biological Filtration: High-surface-area hollow design promotes rapid colonization of beneficial bacteria.
💧 Mechanical Filtration: Traps debris and particulate matter, helping to reduce cloudiness and improve water clarity.
♻️ Reusable & Long-Lasting: Simply rinse with tank water (never tap water) to clean — no need for frequent replacement.
📦 Multiple Sizes Available: Choose from 100G, 200G, or 500G to suit your tank volume and filtration system.
🔧 Easy to Use: Compatible with most canister filters, hang-on-back filters, sump systems, and pond filter boxes.

Perfect For

Freshwater & Tropical Fish Tanks
Koi Ponds & Garden Ponds
Cichlid & Community Aquariums
Sump & Canister Filter Systems
Reef & Marine Setups

How to Use

Rinse the hollow balls with dechlorinated or tank water before first use.
Place them inside your filter chamber, sump, canister filter, or filter bag.
Allow 2–4 weeks for beneficial bacteria to fully colonize the media.
To clean, gently swish in a bucket of used tank water — never use tap water or soap, as this kills beneficial bacteria.

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Learn More About Aquarium Filtration

Understanding how biological filtration works can help you keep your fish healthier. Learn about the nitrogen cycle and safe water quality for aquatic life at the U.S. Environmental Protection Agency (EPA).

Frequently Asked Questions

Q: How many aquarium filter media hollow balls do I need for my tank?

A: As a general rule, use approximately 100G of bio-filter media per 50–75 litres (13–20 gallons) of tank water. For larger koi ponds or heavily stocked tanks, opt for the 500G option to ensure sufficient biological filtration capacity. It's always better to have slightly more media than too little.

Q: How do I clean aquarium hollow filter balls without killing beneficial bacteria?

A: Never rinse your aquarium filter media hollow balls under tap water — chlorine in tap water kills the beneficial bacteria colonies. Instead, gently swish or rinse the balls in a bucket of used aquarium water (removed during your regular water change). This removes debris while preserving the nitrifying bacteria that keep your water safe.

Q: Are these hollow bio-filter balls compatible with koi pond filter systems?

A: Yes! These aquarium filter media hollow balls are fully compatible with koi pond filter boxes, drum filters, and gravity-fed pond filter systems. Choose the 500G pack for larger pond volumes, and place the balls in the biological filter chamber of your pond filtration setup for best results.

Q: How long does it take for beneficial bacteria to colonize the filter media?

A: Typically, it takes 2–4 weeks for a full colony of nitrifying bacteria to establish on new aquarium filter media. You can speed up the cycling process by adding a bacterial starter culture or by transferring some established media from an existing cycled tank.