How Much Chlorine To Add To Pool

Chlorine helps keep your swimming pool clean and free from algae or nasty things that could harm you.

Managing chlorine levels is a key aspect when you own a pool. Chlorine tablets can be the easiest option for maintaining normal levels of 2 to 3 parts per million (ppm).

To spread the chemical, add tablets to an automatic dispenser. Besides this, you have to sanitize your pool using liquid or granular chlorine shock treatments every 1 or 2 weeks.


If you are new to this, you may always read the instructions, yet you don’t fully understand them. In our guide, you can learn all you need about how much chlorine for pool sanitation.

By the end, you’ll know how much chlorine to add to a pool in one dose and how to do this safely so you don’t add too much and ruin your swimming pool liner. (Find the Best Robotic Pool Cleaners)

How Much Chlorine Do I Put in a 10000 Gallon Pool?

Chlorine can burn and smell, so no matter what type of chlorine you use, wear protective gear when using your pool chemicals. At the least, use protective goggles, thick gloves, and a breathing mask no matter if the pool is indoors or outdoors.

Chlorine tablets offer a longer-lasting solution and are the most popular way to chlorinate pools. Being easier to use and kinder to your pool liner, they cover most of what you need besides a pool shock treatment.

For this, you do need liquid or granulated chlorine options. Lastly, tablets dissolve slowly and offer even distribution.

It is easy to purchase chlorine tablets online or from your local pool supply store.

One of the most significant challenges is knowing how much water your swimming pool holds. You need to know this to know how much chlorine to add. So first, measure your pool’s length and width, and then take the average depth.

  1. Multiply the length x width x the average depth.
  2. For a circular pool, measure the diameter, and divide the value by 2.
  3. To calculate the radius, use the formula πr2h. R is the radius, and h is your average pool depth.
  4. For instance, if your pool is 50 ft × 20 ft and the shallow end is 3 ft, with the deep end being 6 ft, your average depth is 4.5 ft.
  5. Once you have this, multiply 50 × 20 × 4.5 ft to find a volume of 4500 cubic feet.
  6. Since 1 cubic foot contains 7.48 gallons of water, your pool holds 33,760 gallons.

Before you add, you need to know how much chlorine in a pool there is. Test the pool water to determine how much chlorine you must add.

Before adding chlorine, conduct a pH and chemical levels test using your pool water test kit. (Find the Best Solar Pool Cover)

Read the instructions, and the label will advise how much to add based on the volume of your pool to reach the target chlorine level in the correct ppm.

Round up to the nearest 5,000 gallons. For instance, suppose you have 33,760 gallons of water in your pool. Your current chlorine level would be around 0 ppm.

Suppose your product advises adding 1 tablet per 5,000 gallons to raise chlorine levels by 1 ppm. You’ll use a dose of 14 tablets to reach a level of 2 ppm.

You can use a chlorine dispenser to make things easier because adding tablets to your pool doesn’t work. Instead, the best way is to use a floating chlorine feeder or skimmer. All it takes is to add tablets to the feeder cartridge and let them dissolve.

You may need to add cyanuric acid if you don’t have a stabilized chlorine product. This is a stabilizer used to make chlorine last longer. If chlorine is labeled as stabilized, trichlor, or dichlor, it contains this acid already.

If you need to purchase, you’ll need to add about 4 pounds of cyanuric acid per 10,000 gallons of water. This will reach a level of 10 ppm. It is advisable to keep cyanuric acid levels to about 50 ppm.

Pool Chlorine

How Much Chlorine Do I Add to My Pool for the First Time?

When adding chlorine (Sodium Hypochlorite) for the first time, add the amount of product needed to reach a free chlorine level from 2 to 3 ppm.

Package instructions will advise how the amount of chlorine to add to raise levels by 1 ppm per 10,000 gallons of water in your swimming pool.

How much liquid chlorine to add to the pool will vary based on the pool’s size and the pH level balance it already has.

How Much Chlorine Do I Add to a 50000 Litre Pool?

Certain people use liquid chlorine to maintain their swimming pools. You can gradually add chlorine to the pool, ensuring any chlorine level works with a dosing machine.

It is challenging to accurately calculate it in that situation and is not recommended for weekly maintenance. To perform a chlorine shock treatment, using liquid chlorine by hand is safe.

Never add more than half a liter per 50,000 liters in this situation. If you add more, it doesn’t mean water quality will improve.

Shocking Your Pool

Tablets are best for routine chlorination; shock treatments come in liquid or granular chlorine forms. The desired amounts will vary, so read the instructions carefully.

  • Typically, you’ll need 3.5 US quarts of liquid shock treatment or 1 pound of granular product per 10,000 gallons of water.
  • Check the instructions to find the amount needed to deliver a 1 ppm change in your chlorine levels. The idea is to bring free available chlorine to a minimum of 8 ppm.
  • Mix with warm water if it needs to be dissolved. Fill a large bucket with warm water as per the instructions.
  • Add recommended chemical amount, then mix until a liquid is evenly dispersed or the granular product has dissolved.

Before swimming, wait until chlorine levels have dropped to 5 per million. Shock treatments raise free usable chlorine levels to 8 to 10 ppm, higher than the healthy swimming range.

Some shock treatments are effective, and you can swim after 15 to 20 minutes. However, in most cases, you need to wait 4 to 24 hours.

What is the Best Way to Add Chlorine to a Pool?

Since it kills bacteria and viruses, chlorine is an essential pool additive. It comes in four forms: tablets, sticks, granules, and liquid.

Granular chlorine may be spread over the pool or added to a skimmer. Dichlor chlorine comes with a small grain size and will rapidly dissolve, so it is not necessary. Before adding to your skimmer. (Find the Best Above Ground Pool Liner)

Cal-hypo chlorine is bigger and has to be dissolved in water, or your pool lining will bleach.

  1. Fill the bucket half full of warm water and add 1 to 2 pounds of cal-hypo chlorine to the water. The size of the pool may change the amount.
  2. Stir in the granular chlorine and water and ensure not to breathe chlorine vapors.
  3. Turn on your pump as you want to circulate the chlorine to settle at the bottom of the pool. Then, remove the skimmer cover and pour your liquid into the skimmer.
  4. Let the pool circulate for a couple of hours before swimming as it lets the chlorine disperse in plenty of time.

If you add chlorine granules to your skimmer, you can do so with these steps.

  1. Please turn on your pump and let it circulate to clear air from the lines.
  2. Take off the skimmer cover and scoop the granules according to the manufacturer’s directions.
  3. Pour your chlorine into the skimmer, not spill it onto the tile around your pool.
  4. Replace the skimmer cover and let your pool run for one to two hours before you go swimming.


  • Never breathe in chlorine vapors as than irritate your eyes and skin and cause breathing difficulties.
  • If you get chlorine, flush your eyes with clean water immediately.
  • Avoid adding chlorine on windy days as dust or fumes can blow in windy weather.

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