English: A partially-submerged pile of lavastone pebbles. The lavastones are located in a lava filter, used to purify rainwater. The water is then used to irrigate agricultural land.
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2008-03-01 15:12 KVDP 2012×1624× (275192 bytes) {{Information |Description=A partially-submerged pile of lavastone pebbles. The lavastones are located in a lava filter, used to purify rainwater. The water is then used to irrigate agricultural land. |Source=self-made |Date=1 march 2009 |Location=Belgiu
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