Easy Biological Filtration for Happy Aquariums
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Give your fish a clean, steady home with mixed bio media that works hard behind the scenes.
This set of 14 types of bio balls brings gentle, steady biological filtration to your aquarium. Each piece offers porous space for helpful bacteria, so your tank can break down waste and stay balanced. Drop them into your filter or sump and enjoy clearer, healthier water with less fuss.
A simple way to boost the health of your freshwater or marine tank.
✔ 14 types of porous bio media
✔ Great for filters and sumps
✔ Helps support stable water quality
✔ Reusable and long-lasting
✔ Easy to rinse and keep clean
Rinse gently in tank water when needed. Available in 100g, 250g, and 500g packs.
We are proud to offer duty-free, reliable, tracked shipping— delivered to your door in over 200 countries worldwide!
Below you can check our average shipping times:
Domestic USA Shipping: 2-9 business days
US & Canada: 7-18 days
Europe: 7-18 days
Europe Plus*: 8-30 days
Australia, New Zealand: 7-18 days
Hong Kong, Singapore: 7-18 days
Rest of the world: 8-30 days
*does not include processing times up to 2 business days or longer in peak periods
Primarily we ship out from fulfillment centers in the United States, Eastern Asia and Western Europe. If the item you've purchased is out of inventory in your nearest location, we'll send it directly from our production lines at the same delivery times as stated in our shipping section.
What do these bio balls do?
They give helpful bacteria a place to grow, which helps break down ammonia and nitrite in your aquarium.
Can I use them in any filter?
Yes, you can place them in most aquarium filters or sumps for steady biological filtration.
How often should I clean them?
Rinse them gently when flow slows or debris builds up. Avoid using tap water to protect the bacteria.
The porous structure helps good bacteria settle in, keeping your tank balanced.
Helps break down waste so your fish can enjoy a cleaner, healthier home.
Great for freshwater, marine tanks, or any sump system.
Just rinse and reuse for reliable filtration day after day.
Drop them into your fish tank filter or sump with no special setup needed.
Reliable media made to support stable, healthy aquariums.
| Features | MK Aquarium | Knock-Offs |
|---|---|---|
| Porous biological media | ||
| 14 media types in one set | ||
| Reusable long-term | ||
| Works in filters or sumps | ||
| Great for freshwater and marine tanks | ||
| Steady support for beneficial bacteria | ||
| Available in multiple pack sizes | ||
| Mesh bag in larger packs | ||
| Easy maintenance | ||
| Designed for stable water quality |
Simply tuck them into a media chamber or mesh bag so water flows through them.
Yes, they offer gentle biological filtration without chemicals.
Yes, they work well alongside sponges, pads, or chemical media.
No, they do not release dyes or odors into the water.
Choose a pack size that fits your filter space. All sizes work the same way.
They can be used in small pond filters as long as water flows through them.
Most will sink once fully wetted inside your filter or sump.
No, just rinse gently as needed. They are made to last a long time.
Yes, they help support early bacteria growth and steady cycling.
