Resun Biological balls small and large
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Size:

Small- 1 inch (26 mm) diameter- P 2 each
Large- 1.5 inch (40 mm) diameter- P 4 each
2,000 pcs of large bioballs cover about 100 Liters volume.

Filtering principle of biological balls: The biological balls have a large surface area where a lot of good vital bacteria such as nitro-bacteria live. These bacteria help improve biological filtration effect and stabilize water quality to maintain healthy living environment. Furthermore, bio balls are compatible with medications used to treat fish diseases since it is made with 100% plastic.