What is inside fish tank filters?
by 
The Curious Bag
ANSWERS: 2
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Fish tank filters contain filter floss to catch debris such as excrement from the fish or uneaten food. Active carbon is contained in filters as sheets or balls to remove toxins from the fish tank.
Source:
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Activated charcoal. That is very good at absorbing nasty substances. It is activated by steaming it. If you take an old filter and pass live steam through it you will see all that crud collect in the output and the charcoal is good to use again.
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