Increasing Chlorine or Bromine Levels in a Pool

Quck answer

To raise chlorine or bromine levels in a pool, follow these steps:

1. Test the water: Use a pool water testing kit to determine the current chlorine or bromine levels in the pool.

2. Calculate the required amount: Based on the test results and the desired chlorine or bromine levels, calculate the amount of chlorine or bromine needed to be added to the pool.

3. Add the chemical: Add the calculated amount of chlorine or bromine to the pool water. Carefully follow the instructions on the packaging for the specific product being used.

4. Circulate the water: Turn on the pool pump and allow it to circulate the water for several hours. This will help distribute the chlorine or bromine evenly throughout the pool.

5. Retest and adjust: After a few hours, retest the water to ensure that the chlorine or bromine levels have reached the desired range. If necessary, repeat the process until the desired levels are achieved.

Remember to always follow the manufacturer’s instructions and exercise caution when handling chemicals. Regularly monitoring and maintaining proper chlorine or bromine levels is essential for a clean and safe swimming pool.


Chlorine and bromine have been widely used as sanitizers in pools since the early 1900s. Most people are familiar with the strong smell of chlorine in public pools, but bromine has a slightly different scent. To raise the levels of chlorine or bromine in your pool, it is important to understand and maintain various aspects of your pool water. One crucial aspect that is often overlooked is the volume of water in your pool, as this will determine the amount of chemicals needed to achieve the desired levels.

The Importance of Water Characteristics

Maintaining the characteristics of pool water involves measuring its acidity (pH), alkalinity, and calcium hardness. Whether you choose to use chlorine or bromine, these characteristics affect the effectiveness of the sanitizer in keeping your pool free of algae and clear. A reliable pool water test kit can help you measure these characteristics easily. Follow the instructions provided with your test kit to check these levels before attempting to raise chlorine or bromine levels in your pool.

pH and Alkalinity Levels

Whether you opt for chlorine or bromine as a disinfectant for your pool water, it is important to maintain the appropriate pH and alkalinity levels. The pH level indicates the acidity of the pool water, with lower pH values indicating higher acidity and higher pH values indicating higher alkalinity.

The pH scale ranges from 0 to 14, with 7 being neutral, values below 7 being acidic, and values above 7 being basic. The ideal pH for pool water is 7.5, or within the range of 7.4 to 7.6.

pH and alkalinity levels are closely related and influence each other. Adding chemicals to raise or lower the pH will also affect the alkalinity, and vice versa. Aim for pH levels between 7.4 and 7.6, and alkalinity levels between 100 and 150 parts per million.

Calcium Hardness Level

Calcium hardness is another important aspect of pool water chemistry, although it is not as critical as pH and alkalinity for sanitizing the pool. Typically, you only need to adjust the calcium hardness once a year by adding the appropriate calcium increaser or decreaser. Some pool shock treatments contain calcium, which can affect the maintenance of calcium hardness levels between 175 and 225 parts per million.

Warning

Chlorine can cause severe chemical burns, so it is essential to take proper safety precautions before handling any chemicals. Wear rubber gloves, eye protection with splash shields, and closed-toe shoes.

Increasing Chlorine Levels in a Pool

Once you have properly adjusted the pool water chemistry, it is time to sanitize the pool by increasing the chlorine levels. Chlorine shock treatments are available in liquid and granular forms, and they are the easiest way to raise chlorine levels in a pool. Follow the instructions provided with the shock treatment you choose, as well as the recommended dosage based on your pool’s water volume.

To maintain the chlorine level in your pool, you can either use a floating chlorine dispenser or a chlorine feeder. Adding a stabilizer to the pool water will help keep the chlorine levels balanced and the pool clean.

If you want to raise the bromine level in your pool, a good shock treatment can help regenerate the bromine levels. However, bromine is more sensitive to sunlight, so maintaining the proper level in an outdoor pool can be more challenging. Similar to chlorine, using a floating dispenser or an automatic bromine feeder can help maintain a bromine level of 3 to 5 parts per million.

Remember to add shock treatment after heavy use or rain, and make it a weekly task to ensure a clean and inviting pool throughout the season.

It is important to wait at least eight hours after shocking the pool before swimming. Also, leave the pool uncovered after shocking it to prevent dangerous fumes from being trapped under the pool cover.

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