Swimming Pool Chemistry Question - pH Level?

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The ideal pH of a swimming pool is around 7.2. At this pH, most bacteria and green algae can't grow. Describe how pH levels of pools are tested, why they change and how the pH is kep at 7.2.

Science HW...Help!
 
Things You'll Need:
PH Increaser
PH Decreaser
Pool Supplies

Step
1
Purchase a pH test kit from the eHow store, a swimming pool dealership or supply center. Kits usually consist of chemically treated paper strips that react to the acid or alkaline levels in the water.

Step
2
Dip one end of a single strip into the pool. It takes only a second to wet the paper.

Step
3
Note how the strip turns from white to a shade of blue or purple. Compare the color to the chart that comes with the kit. A lighter color indicates alkalinity, and a darker color indicates acidity. If the color of your test strip falls outside the acceptable range as indicated on the chart, proceed with the next steps.

Step
4
Use a pH increaser (also available at pool supply centers) to adjust and maintain correct levels if the water is acidic. (Acidic water causes burning eyes, corrodes metals and eats away at plastic and rubber.)

Step
5
Add a pH decreaser to adjust and maintain correct levels if the water is alkaline. (Alkaline water leaves a dry feeling on the skin, looks cloudy and causes a scale to form on any surfaces that it contacts.)
 
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