Gravel and charcoal are used for the purification of water.
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Gravel and charcoal are used for the purification of water.
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✨Gravel and charcoal are used for the purification of water.
✏First, the gravel layer catches large pieces of debris, such as twigs, leaves, and bugs.
✏Next, the sand layer catches smaller particles, such as dirt and grit, and makes the water look clean.
✏ Finally, the charcoal layer gets rid of bacteria and some chemicals.