Clean, Happy Water for Your Fish
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A simple cube that helps your tank stay fresh and balanced.
This Water Purification Cube uses activated carbon to help keep your fish tank water clear and calm. Just place it in your aquarium or aquaponics setup and let it quietly soak up impurities. Your fish get a healthier home, and you get less fuss with maintenance.
A small upgrade that makes a big difference.
✔ Helps keep water clean and clear
✔ Supports a healthier tank for your fish
✔ Works in most aquariums and fish bowls
✔ Easy to place and easy to remove
✔ Comes in large and small sizes
Rinse the cube before first use. Place it in an area with good water flow. Replace when it no longer keeps your water clear. Sizes: Large 10cm x 10cm x 10cm, Small 10cm x 10cm x 5cm.
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.
How do I use the Water Purification Cube?
Rinse it, then place it anywhere in your fish tank where water flows freely.
The activated carbon helps lift impurities from your tank, keeping the water looking fresh.
Cleaner water makes it easier for fish to breathe and swim comfortably.
Just place the cube in your tank and let it work with your regular filtration.
Choose from two sizes and versions with or without filter cotton.
Works well in aquariums, bowls, and small aquaponics systems.
Simple design, strong results.
| Features | MK Aquarium | Knock-Offs |
|---|---|---|
| Activated carbon cleaning | ||
| Two size options | ||
| Optional filter cotton | ||
| Easy placement in tank | ||
| Helps reduce water odors | ||
| Keeps water looking clear | ||
| Gentle for most fish | ||
| Works with aquarium flow |
Yes, larger tanks may benefit from two or more cubes depending on water volume.
Place it near your filter or any area with steady water movement.
No, it works best as a support to your usual fish tank filter.
No, it simply helps keep the water looking clear.
Yes, it’s a finish that won’t affect your water or fish.
It works best indoors in smaller aquariums and bowls.
No, it works quietly with no moving parts.
When the water stops looking clear or smells off, replace the cube.
Try the small size, which is designed for tight spaces and simple setups.
