While this is technically true, it's usually a safe bet that potable water requirements are more stringent than the typical fishkeepers. The only place this falls down is water treatments like chlorine, fluorine, and other germicides that are deemed safe for potable water, that you don't want in your tank. Potable water storage tanks and materials have to pass extraordinarily strict leeching requirements. Many of the materials we use in building tanks are NOT certified for potable water, and are not even rated for continuous submersion.nolapete;3698476; said:suitable for potable water does NOT mean it's safe for aquatic animals.