What Causes White Mold On Top Of Pool Water? [Solved!]

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Most people can recall the disgusting feeling of seeing white fur and fungal growth on top of the water in their pool. Fortunately, things like this are rare nowadays. But what causes white mold on top of pool water in the first place? Here’s a list of some of the most common causes that come to mind.

Leaking Sewerage

There are two parts to a household’s plumbing system: the water supply and the sewage removal. The water supply lines bring water into your home, while the sewage removal lines take away any waste fluids and solids that may be generated by your home’s population. These are the two separate lines that you’ll often see bundled together, with the sewage pipe going towards the drain and the water pipe going towards the taps. If you have seen any of these bundled pipes before, then you know what they are. But what exactly are they? Well, they are the pipes that carry your home’s waste water and fluids away from the residence and into the public works’ sewage treatment plant. These pipes are usually made of metal and rubber, and over time they can deteriorate due to constant exposure to chemicals and moisture. When this happens, there’s no turning back. The garbage will just begin to flow in the opposite direction. With this in mind, it’s no wonder that most people are obsessed with maintaining a clean pool.

Foul Water

Believe it or not, your pool water is constantly under attack from several sources. Living creatures such as algae and bacteria are always living and working at the bottom of your pool, consuming nutrients and digesting organic materials. In addition, the air around your pool is rich in pollution and particulates, which can also find their way into your pool through evaporation. While it may be challenging to maintain a clear pool with all of this going on around it, this is a testament to how important it is not to overload it with too many foreign substances. If you want a clean pool, then you’ll have to deal with this first. Otherwise, don’t be afraid to add a few toys to it to keep things interesting for the kids.

Improper Pool pH

Your pool’s pH balance is extremely important. Too much acidity or alkalinity can be severely damaging to your pool’s ecosystem, rendering it useless for fish and other underwater life. To keep things simple, let’s say that your pool is 8.4 or greater, which is fairly close to neutral. If this is the case, then you can consider yourself to be swimming in perfect conditions. However, if your pool’s pH is less than 8.4 or greater than 10.4 then there’s a good chance that you’ll experience problems with algae growth and general biological degradation. Fortunately, there’s an easy way to check your pool’s pH level. All you need to do is measure the hydrogen ion concentration in parts per million (ppm). This is typically done with a liquid PH probe, which you’ll find at most hardware stores. Use this probe to take a sample of the water in your pool and input the results into your pool’s pH calculation software. With this in mind, it’s important to keep an eye out for pH spikes, which can be caused by unusually high water temperatures or large amounts of rain falling within a short space of time. Fortunately, these are both relatively easy to deal with, as long as you catch them early on. Otherwise, you may find yourself in a situation where the only option left is to drain and refill the pool. So watch out for any sudden changes in your pool’s pH levels.

Improper Ammonia Removal

Another important factor to consider is your pool’s ammonia levels. Ammonia is a colorless, water-soluble substance that naturally occurs in soil and marine water. In addition to being toxic to fish, ammonia will also promote algae growth and plant decay. So it’s not something that you want to have floating around in your pool for very long. Fortunately, ammonia is fairly easy to remove. For this, you’ll need an ammonia removal cartridge, which is a cylinder that contains a chemical coating that attracts and binds to ammonia molecules. When this cartridge is changed out for a new one, it will effectively reduce your pool’s ammonia levels by about 60%. This should be changed out every month or every other month, depending on how often you use your pool. If you use your pool a lot, then you may want to consider getting a couple of these ammonia removal cartridges.

Chemical Cleaning

Your pool will require regular cleaning to maintain its healthy appearance. For this, you’ll need the proper pool chemicals. For the best results, it is recommended that you test your pool water for chlorine and alkalinity levels before you begin cleaning it. This will help you determine what exact chemicals you’ll need to use in order to achieve the desired results. Once you have this information, you can order the appropriate chemicals online or at your local pool supply store. Alternatively, if you are planning on cleaning your pool manually, then you’ll need to include chemicals such as chlorine, bromine, and/or potassium permanganate in your cleaning regimen. Be careful not to mix up the concentrations of these chemicals or you may end up harming yourself or the environment.

Saltwater Hard Water

Saltwater hard water is pretty self-explanatory. This is the type of water that comes from the sea and is free of any dissolved solids. The presence of these solids tends to cause numerous problems for the home’s water supply, especially in terms of scaling and corrosion. Corrosion is the deterioration of metal caused by chemical reactions with water. These reactions can eat away at the metal and form an unattractive layer of rust on its surface. It’s always best to filter saltwater hard water prior to using it for any purpose. This can help remove some of its unwanted elements. In the case of a corrodible metal such as galvanized steel, you’ll need to employ the use of rust preventatives such as zinc and/or magnesium. Otherwise, you may end up with severe damage to your home’s plumbing system.


Fluids and solids from outside sources such as rainwater and atmospheric dust can make their way into your pool through a process known as surface runoff. This is a major problem when it comes to having a clean pool, because fluids such as oil and gasoline from vehicles or construction equipment can remain suspended in the water for some time, eventually fouling it up. In order to prevent this from happening, there are several solutions. First, you could install a rainwater tank that stores the excess water during periods of heavy rain. Alternatively, you could lay down some plastic or asphalt tile along the edge of your pool, which will prevent some of the more harmful materials from being washed into the water. Finally, you could put in place a barbed wire barrier around the pool, which will stop many of the smaller particles from being washed into the water. In terms of the water itself, you don’t want to let any fluids stand in the water for too long or they will eventually find their way into the pool through evaporation. So, when there’s any chance of rain, then it’s best to take cover indoors.

Too Much Light

Luminous light or ultraviolet (UV) rays from the sun can cause severe damage to the skin and, as a result, to your pool’s ecosystem. Excessive exposure to this type of light can lead to skin cancer. For this reason, it’s best to keep your pool area a safe distance away from the windows, especially during the day. Fortunately, there are also some UV-absorbing chemicals that you can add to your pool to negate this threat. But even more importantly, you should always take care when using any type of lighting or pool lamps near the water. This is due to the fact that most lamps have lead cables that can leach into the water over time and eventually cause environmental problems.

Too Much Wind

Too much wind can disturb the surface of the water, causing it to become agitated and possibly leading to physical damage. For this reason, it’s best to keep your pool area at a safe distance from any breezes. This is especially important in the case of very dry climates, where the wind can quickly become a source of extreme dryness. If you live in a place where the wind can be a menace to your pool’s surface, then you may want to screen it or build a shelter around it. Alternatively, you could purchase an electric wind chime that will gently play music while showering your pool area with beautiful colors.

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