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Finally, the water from the disinfected beaker was poured out to represent water being "discharged" or put back into nature, typically rivers,  to return to the natural water cycle.

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Bleach is added into the beaker. This represents the added chemical to the water at the end of the process that kills micro-organisms that may linger.

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The mixture is poured into the SST beaker and stands for one minute. Some clusters of the dry sand sink to the bottom. This represents the secondary sludge of the secondary settling process.

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The mixture of dry sand is added. This represents the fourth step of wastewater treatment where a mixture of tiny organisms are added to feed on the dissolved nutrients of wastewater.

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Wool is wrapped around a spoon to represent a scraper. The scraper takes away surface leaves and a layer of oil. This represents the third step of the primary settling process where sludge is formed at the bottom of the tank.

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The mixture is stirred and some heavy solids from the wastewater collects on the bottom. This represents the second step of the water treatment process. The grit beaker represents the grit chamber where all of the heavy grit (soil, sand, stones, etc.) is sunken to the bottom and removed.

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A net was placed over the grit chamber beaker and the wastewater was poured into it. This represents the first step of the water treatment, as wastewater initially goes through a screen to prep for grit removal.