CHENGU 300-Piece Black Bio Balls for Aquarium (1.02 Inches) with 5 Zipper Filter Bags

Overview

CHENGU's 300-piece bio balls kit is designed to support biological filtration across a wide range of aquatic environments. The set includes 300 black bio balls, each about 1.02 inches in diameter, plus five black mesh filter bags with a zipper for quick, secure material handling. The compact spheres are uniform in size and finish, offering a clean, professional look in your filter chamber.

These spheres are molded from durable plastic and feature a biochemical cotton layer inside. The combination provides a multi-layer media option that can be used in canister filters, pond filters, or inside tanks to help support beneficial bacteria and keep systems running smoothly. The black color helps the media blend into most tanks, reducing visual disruption while maintaining filtration effectiveness.

Quality and design highlights

The biomedial design pairs sturdy plastic with an inner cotton filter layer. The result is a media piece that holds its shape under water and offers a robust surface area for microbial colonization, all while remaining lightweight for easy handling.

How it works in practice

In operation, the 1.02 inch spheres create multiple micro-porous pathways that slow water slightly and maximize contact between water and the biofilm. The internal cotton adds a secondary filtration stage, which can contribute to clearer water and steadier biological filtration over time.

What’s in the box

• 300 x bio balls crafted for resilience and a consistent size
• 5 x black mesh filter bags with zipper closure for secure containment

Key design features

• Biochemical cotton design adds filtration media and reduces maintenance needs
• Multi-sheet surface increases available area for microbial colonization and fosters even flow
• High-density plastic construction provides durability while staying lightweight
• Porous internal structure helps slow water flow to enhance contact time with the media

Versatile use scenarios

Suitable for water garden ponds, freshwater tanks, and saltwater setups. The bags allow flexible placement and removal, supporting routine maintenance or media replacement as needed.

Notes: color and size may vary slightly due to batch differences and screen settings. Keep small parts away from children.

Whether you are looking to support a thriving biofilter in a canister system or add versatile media to a pond setup, this kit offers a practical, ready-to-use option with clear benefits and straightforward handling. Results may vary depending on tank size, stocking, and existing filtration.