We recommend that water flow through filter media in this order:
1. Mechanical filtration (filter floss, sponges, etc.)
2. Chemical filtration (MatrixCarbo™n, PhosGuard™, Purigen®, etc)
3. Biological filtration (Matrix™)
Every filter is different, so the exact placement of Matrix™ will vary from brand to brand. Consult your filter’s instruction manual to find the direction of flow for your filter.
For more detailed information about layering medias in your filter, check out FAQ: Where should Seachem® filter medias go in my filter?
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