How do I choose a fish-safe pond liner, and are Firestone and RPE liners safe for aquatic life?

When building a pond for koi, goldfish, or any aquatic life, it’s critical to use a fish-safe pond liner. A fish-safe liner means the material doesn’t leach toxic substances into the water and maintains a stable environment, especially over time.

Firestone pond liners, specifically the Firestone EPDM (like PondGard), are widely regarded as one of the best fish-safe options. These liners are made from synthetic rubber, are highly flexible, and are manufactured without harmful additives.

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