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Question:

What are the filter materials for aquariums? What's the function? How do they use them?

What are the filter materials for aquariums? What's the function? How do they use them?

Answer:

volcano stone itself pore more, and ring like you can filter impurities in water
Those things are on the filter cylinder or tank filter, these things are good for pH and pH stability of the magnetic ring can also be some beneficial bacteria are good,
You've been full, do not need so much.

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