- 1). Test the pool water with a pool testing kit. Take samples from the pool using the included test tubes and add testing solution. Read the instructions included with the kit for specific amounts of testing solution to use. The water will change color, which you will need to compare to a color wheel to determine both the pH and chlorine levels in the pool.
- 2). Add chlorine to your pool. Depending on the results of your tests, you may need to add chlorine. Pools should have a chlorine level of about 2 to 4 ppm to keep algae at bay. If the level is lower than this, add as much as necessary to raise it to the optimal range. Follow the instructions on the packaging for specific amounts to use based on the initial chlorine level and the volume of your pool.
- 3). Add baking soda to your pool if the pH level is below 7.5. Pool water should be slightly alkaline, between 7.5 and 7.8, in order for chlorine to be effective. Add about 2 lbs. of baking soda if the pH level is between 7.2 and 7.5. If it is lower than 7.2, add between 3 and 4 lbs.
- 4). Allow the pool water to cycle through the filter for about three or four hours so the chemicals can be evenly distributed. Test the water again before getting in. If the chlorine and pH are at the optimal levels, you should notice a decline in algae within a day or so.
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