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How much chlorine to add to the pool per litre? To determine the amount of chlorine required in 1000 litres of pool water you will require a calculation based on the temperature and pH of the water. One may use the following formula to determine how much chlorine is required in 1,000 litres of water that is at room temperature and has a pH of 7.

It depends upon a number of factors. Get an estimate of how much chlorine you will need to add one time. The following information will give you a better idea of how much chlorine you need if you are recirculating your pool water.

To calculate the amount of liquid chlorine you need to keep your swimming pool clean and healthy, use the following guidelines.

1,000 litres of water will hold 2.5mm (1/16th inch) of liquid chlorine.

2.5mm (1/16th inch) of liquid chlorine will disinfect 25,000 litres of water.

How much chlorine do I put in a 1,000-gallon pool?

Example: If a 1,000,000 litre pool is 3.0 metres deep, divide 1,000 by 3, then multiply by 2 to allow for 2.5mm of liquid chlorine per litre. This gives a result of 333 millimetres (or 13 inches) which is rounded up to 13cm or 5 inches. Divide this figure by 2.54 to obtain the required millilitres. Result: 122 millilitres.

How much chlorine in water is safe for the skin and how to measure it?

Chlorine is a useful pool chemical that helps kill bacteria, algae and other contaminants. However, it can also burn or dry out your skin on contact. The safe amount of chlorine in pool water may vary depending on whether it is a hot tub, spa, or swimming pool.

Chlorine, as in most disinfectants (including water), has a chemical half-life. This means that the concentration of chlorine decreases over time as it reacts with other substances in the water. The following table summarizes how long it takes for 1 part per million (ppm) of chlorine to decay to 0.5 ppm.

As the concentration of chlorine decreases over time so does its effectiveness as a disinfectant. Most public pools will keep their chlorine at or above 1 ppm to maintain their Chlorine Shock value, which kills bacteria that may have gotten into the pool.

Is chlorine in water bad for you?

Put simply no. In swimming pools, jacuzzis and spas chlorine is used to disinfect the water and keep it clean from harmful bacteria as well as other particles that may be lurking in the water. Chlorine levels in the water will vary from pool to pool depending on the number of people using it, how often and for how long.

Testing for chlorine levels in swimming pools or spas can be done easily with chlorine test strips, or you can purchase a standalone chlorine analyzer that will give you readings in parts per million (ppm).

The most common misconception about pool water is that it’s a “chemical soup.” While it sounds scary that the water you swim in contains many chemicals, it’s actually several harmless chemicals combined to produce the disinfectant effect that protects swimmers from germs. 

Chlorine itself is an odourless gas, so you can’t tell by looking at the water if it has chlorine in it. The following are some common pool chemical levels.

In a swimming pool, for example, chlorine is usually added to the pool at a level of 1ppm (parts per million) to 4ppm. This is to ensure that the pool water is clean, safe and free from bacteria, viruses and other harmful particles. 

The amount of chlorine used for a pool would differ slightly depending on factors such as the size of the pool and how many bathers use it.

Similar levels are also used in spas. Although most spas will have higher levels of chlorine than pools as they are located indoors and people go into them without showering beforehand so, therefore, will have large amounts of bacteria on their skin which they bring into the spa with them.

Chlorine can be deadly if ingested or inhaled in large amounts but when it is blended with other chemicals such as cyanuric acid to form ‘free chlorine’ it becomes harmless to us humans. 

This is why it is incredibly important that the levels of chlorine used in swimming pools and spas are closely monitored by experts and that all chemicals used are fully licensed for use in swimming pools, baths and spas etc.

See also:

  1. Is Pool Chlorine The Same As Bleach?
  2. Findings: Will baking soda lower the chlorine levels in the pool?
  3. 10 Best Pool Clarifier 2022 You May Not Have Looked Yet
  4. 10 Best shock treatments for swimming pools review
  5. 6 Best Chlorine Tablets for Swimming Pool – Top Picks & Tips