Why Does My Pool Water Turn Green Weekely? [Updated!]

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Swimming pools can be a source of endless amusement but also cause a lot of stress when they cause your pool water to become discoloured. This article will introduce you to the reason behind a lot of those strange pool water changes and how you can prevent them. So sit back, grab a drink, and get ready to learn!

Reasons For Pool Water Changes

There are several reasons why your pool water might change. The most common cause is that the pool is not built properly. This could range from an overlooked leak to an incorrect installation of equipment such as the pump. The second most common cause is that there is a chemical imbalance in the water. Regardless of whether this is done intentionally or by accident, the end result is usually the same – your pool water will become tinted and eventually turn green.

As for the first cause, you should know that, generally speaking, building a swimming pool, no matter the size, takes a lot of time and effort. You will have to hire a professional builder who is well-versed in handling all types of pools to help you through the entire process. From picking the right spot for the pool to advising you on how to properly maintain it once it is built, they will be able to assist you in choosing a good time to start swimming lessons for your kids.

Improper Installation Of Equipment

Depending on the size of your pool, it might be hard to keep an eye on every little thing that goes in or comes out of it. This is why it’s important to hire those who are experienced and know how to install and work with all types of equipment, especially if you are using a pool that is larger than 20,000 liters.

Leaky Pool

Even if you have built your pool with the best intentions and installed all of the necessary equipment, it will not remain unaffected by the effects of time and water. This is where a lot of the trouble starts. Leaky swimming pools are the direct result of small or big leaks in the foundation or the piping. The most important thing to do in this situation is to spot the leak as soon as you can and fix it before it causes any serious damage.

Small leaks can be easily fixed by putting in some aftermarket parts or with a little bit of repair work. Bigger leaks, however, require more expertise and could cost you a lot of money. If a leak is not fixed properly, it could lead to permanent damage, especially to underground piping that might be concealed beneath the surface. If this is the case, you might have to dig up the entire pool and replace it with a brand new one – not a small price to pay for a poorly installed pool!

The presence of contaminants in your pool water can also cause it to turn green quicker than normal. This could be due to various reasons, including malfunctioning equipment or an overflow from a toilet. The most common type of contaminant is chlorine, which is added to pools as a means of preserving the water’s cleanliness. The good news is that there are several different chems you can add to your pool to counter these unnatural sources of contamination. If you do not add the right chemicals to your pool, it will quickly become polluted and start to deteriorate.

To keep your pool cleaner than crystal clear, you should add two chemical compounds, one called algaecide and the other disinfectant. The first compound, algaecide, will help fight off algae growth which, if left unchecked, could seriously clog up your pool’s filtering system. The second compound, disinfectant, will help remove all of the contaminants that are already present in your pool’s water, preventing future algae growth in the process.

Chlorine Dioxide Pucks And Doses

There are several different types of chlorine dioxide pucks and doses, and it’s important to choose the right one for your pool. This will help ensure the proper balance of chlorine and oxygen when mixed together in your water. You will need to add a certain amount of chlorine to your pool in order to maintain a safe, clean environment for your family and friends to swim in. The good news is that there is a wide variety of pucks and doses available making it simple to find the right one for your pool needs!


Your pool’s water should always be kept at a constant temperature, which, for the most part, will remain close to the pool’s set temperature. If you allow your pool water to become too warm, it will not only be unpleasant for the swimmer but could also prove dangerous. To ensure you keep your pool at the right temperature, it is a good idea to invest in a pool heater which is specifically designed for this purpose. Heating your pool will help you maintain a crystal clear pool regardless of the season or time of day!

Phosphates, Nitrates, And Sulfates

Apart from chlorine, the next most common source of contaminants in swimming pools is phosphates, nitrates, and sulfates. These compounds are present in various forms in soil and water and can create an unhealthy environment for anyone who is swimming or otherwise engaging in physical activity in the pool. To tackle these chemicals and maintain a good pool environment, you should monitor and test for these chemicals regularly to ensure they remain at safe levels. This can be easily done with a water test kit which can be found in most any hardware store.

With all of these potential reasons why your pool water might become discoloured, it is important to understand how to determine the cause. With just a bit of research, you will be able to find the exact answers you are looking for!

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