Can Goldfish Live in Distilled Water? The Importance of Electrolytes

Distilled Water Lacks Essential Minerals

Goldfish need calcium, magnesium, and trace elements for osmoregulation. Pure distilled water causes fatal electrolyte loss.

Remineralizing

Add aquarium salt mix (not table salt) or a commercial remineralizer to achieve 100–200 ppm TDS. Alternatively, use spring water or dechlorinated tap water if parameters are acceptable.

When to Avoid Tap Water

Only if tap water has extreme pH, high ammonia, copper, or other toxins. Most municipal water is fine after dechlorination.