SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/fish-chemical-filtration

What does chemical filtration often use?

Activated carbon to remove dissolved chemicals.

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  1. Activated carbon ✔
  2. Gravel
  3. A heater

Why: Chemical filtration adsorbs some dissolved organic compounds, odors, and discoloration. It does not replace biological filtration.

Huh, didn't know that: Merck lists replacing the filter carbon every 1 to 3 months.

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References

Answer: Activated carbon. Chemical filtration adsorbs some dissolved organic compounds, odors, and discoloration. It does not replace biological filtration.

  1. Merck Veterinary Manual (pet owner): Providing a Home for Fish www.merckvetmanual.com/all-other-pets/fish/providing-a-home-for-fish
    activated carbon, which removes certain chemicals and minerals
    Checked 2026-10-11.
  2. Merck Veterinary Manual (pet owner): Routine Health Care of Fish www.merckvetmanual.com/all-other-pets/fish/routine-health-care-of-fish
    Every 1 to 3 months: Replace carbon in filter
    Checked 2026-10-11.

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