ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Water evaporation residues. Evaporation residues from pond water(left) and distilled water (right). Distilled water has had all its ions removed. Pond water typically contains dissolved mineral salts, usually magnesium and calcium carbonates and sulphates. These are left behind as white crystals when the water evaporates.
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