How Much Chlorine Should You be Adding to Your Pool?

Adding chlorine to your pool is a crucial step to ensure that your water remains at a healthy pH level. Whether you have an above-ground or in-ground pool, the pH levels of your water should be approximately 7.2 to 7.6. By adding chlorine to your pool, you are actively balancing your water which prevents growth and maintains a healthy environment to swim, play and relax. But how much should you be adding? Here’s what you need to know.

How Much Chlorine You Should be Adding to Your Pool

Although the amount you add will, of course, be affected by the size of your pool, here’s a basic rule of thumb to follow. Typically, the chlorine to water ratio is about 1 to 3 PPM (parts per millimetre), and to get this balance, it will be about 0.00013 ounces of chlorine to every one gallon of pool water. Although this might sound like a lot of math will be involved, there are a few easy ways to find your pool’s perfect balance. By determining how many gallons of water your pool holds, you can then do a simple calculation to figure out how much chlorine you will need. To do this, you will need to measure and multiply your pool’s width, length, and average depth and multiply that number by 7.5, as there are 7.5 gallons per cubic feet. Once you have your answer, you can then multiply this number by 0.00013. For example, say your pool has 6,700 gallons of water. Multiplying it by that number will give you about 0.87 ounces of chlorine. If liquid chlorine is what you prefer using for your pool, then you should be adding no more than half a litre per 50,000 litres of water. It’s better to add smaller amounts of chlorine and check your pH levels regularly instead of adding too much chlorine initially. Although chlorine is necessary for the proper health and maintenance of your pool water, too much of it could cause possible damage to your lining and also isn’t safe for swimmers.

Factors Affecting How Often You Should be Adding Chlorine to Your Pool

Many different factors play a role in how often you will need to add chlorine to your pool. To start, the more people in the pool, and the more frequently the water is being used, the more often you should be checking your water’s pH levels. Different things like an individual’s deodorant, cream, shampoo, conditioner, and so on can all affect the water’s quality. Any outside influence regularly changing the state of the water will make it necessary for you to be actively checking your levels at least a few times a week.

Other outside influences, like insects, dirt or leaves, can affect the balance of your pool’s water. If you’re finding that you have a lot of these things in your pool, it’s best to vacuum them out, but it also might be necessary to add chlorine more frequently as these things will typically interfere with the effectiveness of chlorine. 

The weather also plays a large role. Whether it’s rain or shine, both of these extremes affect how much chlorine will need to be added to your pool. For example, periods with very hot temperatures and high UV readings will make for less chlorine in your pool. Rainwater reduces your chlorine’s effectiveness and interferes with the balance needed to have healthy water levels. In either case, using a pool cover can significantly help with the longevity of your pool’s healthy pH levels and active chlorine levels. 

Liquid Chlorine vs Tablets

Many people prefer using chlorine tablets for their pools, as once they’re placed in the dispenser, they will slowly dissolve. This helps keep your pool levels at a steady and constant healthy reading. In addition, tablets are more often used long-term to keep the pH levels where they need to be. Alternatively, liquid chlorine is often used at the beginning of the season or in cases where larger doses of chlorine are required in order to get your water at the right pH. 

Although it might seem like a delicate balancing act at times, by regularly checking your water with testing strips, it’s pretty straightforward to keep on top of your pool’s pH levels, so not to worry!

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