The best material for every canister filter. No need to buy new ones when they get dirty. Just rinse the media with warm/hot water and it will last forever. I have fluval fx5 and fx6. I buy 5 liters of eheim substrate for each of the filters. And I fill all 3 baskets with it. No need for bio rings or charcoal. It's just the best, no exaggeration.
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