Hose left on overnight. 7 adult koi in pond full of tap water. Swimming slowly, unhappy. Asks what to do and time window.
Chloramine (in most tap water) kills via gill damage. Liquid dechlorinator (sodium thiosulfate) is the only fast fix. Dose for full pond volume immediately.
Chlorine poisoning kills in 2–5 hours. If they're alive after overnight, you may have a narrow chance. Dechlorinate anyway—it can't hurt.
Never leave hose unattended. Use timer or auto-shutoff.
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