Optimized Filtration Design:
This 100-piece set of black filter balls (approx. 0.7 inch each) features an internal cotton core to increase surface area and enhance biological filtration. These high-performance bio media balls support healthy ecosystems in both freshwater and saltwater aquariums

Durable and Efficient Construction:
Made from high-density polymer for long-term use, each biomedia unit promotes effective water flow and resists debris buildup, making them ideal for both filters for fish tank setups and larger pond fish tank filter systems

Low-Maintenance Operation:
The cotton-core structure reduces clogging and ensures reliable filtration. Just rinse before first use and place directly into filters for fish tank or pond systems for efficient, ongoing performance with minimal upkeep

Versatile Compatibility:
Designed for a variety of applications—including canister filters, sump filter media systems, aquaponic setups, and more—this flexible bio media balls set works well in koi ponds, reef tanks, or planted aquariums