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Alum in a swimming pool clarifies the water. Alum is used in water treatment plants for this purpose and is in the drinking water suply in trace amounts. Alum in a swimming pool clarifies the water. Alum is used in water treatment plants for this purpose and is in the drinking water suply in trace amounts. Alum is a floculant it is cast over the surface of water, as it sinks to the bottom it attaches its self to impurity's in the water eventualy one will note that all of the water has cleared up except for a layer at the bottom, this is normally disposed of leaving clean uncontaminated water.

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16y ago
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11y ago

I don't use any. Just chlorine and baking soda.

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11y ago

because you might use the alum by putting wier around the pool

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Q: How much alum do you use in swimming pool water?
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