| 11. | These usually include reverse osmosis units and some activated carbon filters.
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| 12. | Activated carbon is usually derived from charcoal and is sometimes utilized as biochar.
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| 13. | Activated carbon and zeolites are also frequently added to aquarium filters.
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| 14. | Modern alternatives to bone char include activated carbon and ion-exchange resins.
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| 15. | Preliminary care consists of gastric decontamination with either activated carbon or gastric lavage.
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| 16. | It is also involved in the bio-recycling of spent activated carbon filtration media.
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| 17. | They're trying granular activated carbon to remove chemicals and ozone gas to kill parasites.
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| 18. | It has generally performed as well as activated carbon from other sources, notably coal.
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| 19. | Over time the activated carbon becomes thoroughly coated and it ceases to remove pollutants.
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| 20. | Sand, anthracite or activated carbon filters refine the water stream, removing smaller particulate matter.
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