Marine Water Filter Media
Marine aquarium filter media work together with skimmers and circulation to keep the water clear and stable: mechanical (socks/fleece), biological (porous media), and chemical (carbon, anti-PO₄/NO₃, zeolite).
Read more
Recommended flow order: mechanical (socks 100–200 μm / rolls 50–100 μm) → biological (sintered ceramic rings/spheres/blocks) → chemical (carbon, resins) → outlet/skimmer.
Mechanical: removes particulate matter and reduces DOCs. Socks: replace/wash every 1–3 days; rolls: automatic advance, ideal for sumps. Prevents dirt from entering subsequent media.
Biological: high surface area media (sintered ceramic/glass) host nitrifying/denitrifying bacteria. Rinse in saltwater (not tap water) and ensure good flow.
Chemical (targeted use):
- Activated carbon: clarifies and removes contaminants/odors; excellent post-treatment. Rinse well; short cycles 2–4 weeks.
- Anti-PO₄ (GFO/granular ferric oxide): powerful; start with half dose and monitor PO₄ to avoid sudden drops (pale corals). Aluminum resins: fast but can irritate some soft corals → use with caution.
- Anti-NO₃: selective resins or denitrifying media; effective as support, do not replace nutrient management/skimmer.
- Zeolite: for ULNS systems; requires a dedicated protocol (bacteria/carbon source and shaking). Recommended for experienced users.
Reef considerations: remove carbon/resins during medication or bacterial dosing; re-insert at the end of the cycle. Avoid peat in marine aquariums. Keep nutrients stable (PO₄ and NO₃ not at zero) for color and growth.
Tip: focus on large biological volume and efficient pre-filtration (socks or roll). Use chemicals in targeted cycles, measuring PO₄/NO₃: effectiveness without "stripping" them to zero.
— Advice from the Hobby Pesca & Acquari Team
