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SESK: Stuff Everyone Should Know · sesk.info/fish-store-treated-water

For emergencies, how much extra treated water does Florida Sea Grant suggest keeping on hand?

At least 10 to 20 percent of your tank's volume.

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  1. About 1 percent of the tank's volume
  2. At least 10 to 20 percent of the volume ✔
  3. None, use untreated tap water

Why: If ammonia rises during an emergency, you will need a partial water change. Florida Sea Grant says to store treated water, with chlorine and chloramines removed, equal to at least 10 to 20 percent of the tank.

Huh, didn't know that: It also says to keep aquarium dechlorinator on hand to treat new water as needed.

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References

Answer: At least 10 to 20 percent of the volume. If ammonia rises during an emergency, you will need a partial water change. Florida Sea Grant says to store treated water, with chlorine and chloramines removed, equal to at least 10 to 20 percent of the tank.

  1. Florida Sea Grant: Q&A, How to Keep Your Fish Tank Safe During a Power Outage www.flseagrant.org/qa-how-to-keep-your-fish-tank-safe-during-a-power-outage
    equal to at least 10 to 20 percent of your tank's volume for emergencies.
    Checked 2026-10-11.

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