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What Causes Cloudy Pool Water?

Milky pools only work in fantasy films. In real life, a milky pool only works in customized spa services or a milk bath. When it comes to swimming pools, the sight of the cloudy pool water is such a turn-off. Nobody wants to swim in it.

So, what actually causes cloudy pool water?

Before we even go there, let’s be aware of the danger first. Not only it looks inviting, but cloudy pool water also makes you unable to see what is underneath. Who knows? There might be dangerous bacteria breeding in. Once that happens, your pool and its circulation system can be seriously damaged.

The last thing you need is losing a lot of money from fixing the expensive damages caused by bacteria. It is even worse if it causes serious illnesses. Before jumping in to try to fix things, find the cause first. Once you do, then you can go from there.

The Evil Five that Cause Cloudy Pool Water

One of the chemical to clean cloudy pool water

This may seem like an exaggeration to you, but these five (5) causes of the cloudy swimming pool water are indeed evil. No worries, each has its own fixing solutions:

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1. A chlorine imbalance

There are plenty of causes for low free chlorine levels. That could be a heavy usage, the rain that dilutes the chlorine, or ultraviolet that oxidizes lots of free chlorine when the weather is hot. If it is an outdoor swimming pool, you might want to use cyanuric acid as the chlorine stabilizer.

Still, you need to be careful with cyanuric acid. If you use it too much, the water will become cloudy and unsafe for a swim. You can shock the water with liquid chlorine if this happens to be the case.

We have a detailed article explaining the best chlorine tablet that you might want to read. It will give you a clear guide to choose which chlorine tablet for your pool.

2. The problem with pH levels and total alkalinity

The pH concentration in the water plays a major role in affecting how the chemicals function. That includes the chlorine. If the pH level goes up, lower it with muriatic acid or sulfuric acid. If the pH level is lower than 7.0, the pool water turns cloudy. That means inviting harmful bacteria like algae to breed.

To make sure that the total alkalinity does not go beyond limits, make sure it stays between 80 and 120 ppm. This will avoid raising the pH levels, which will cause calcium scaling.

Muriatic acid and aerate are needed to lower the total alkalinity without any extra equipment. This will also restore the pH levels without increasing them way too high.

3. The trouble with pool circulation and filtration systems

The poor pool filtration and circulation systems need to be dealt with immediately. These are the steps:

  • The return fittings should be turned to point down. This helps the water at the pool’s bottom to circulate properly. The pool structure also determines how this step is done.
  • Use the right pump size to clean the water adequately.
  • Ensure that the filtration system is working well and long enough. A 24/7 run is the best to keep the water clean. Since home pools are not that busy, an eight to ten hours a day is also okay.
  • Remove any particles that might be blocking the filter. This is to avoid the water from becoming dirty, cloudy, and algae-infested.
  • Clean or replace the D.E and cartridge filter medium on a regular basis. Depending on the usage, the cartridge should be replaced at least once or twice a year.

4. The foreign particles

Removing foreign particles, scrubbing, and vacuuming the pool should be done. Foreign particles include sunscreen and other body oil from swimmers as they dive in. A pool clarifier helps to remove the excess in the pool water. Otherwise, the pool water will get cloudy, especially if many swimmers use the pool.

Scrubbing and cleaning the pool with a big leaf net and a vacuum help to remove algae. If some of it still remains, use a pool shock to further clean them.

A chlorine stabilizer is needed if your swimming pool is outdoor since the ultraviolet can cause chlorine depletion. Rain can also do that. A tarp to cover the pool when not being used is also an effective prevention.

5.The algae

Algae in swimming pool

As mentioned earlier, there are ways to remove algae from the swimming pool water. Algaecide is possible if the algae are still young and green, especially since even the smallest amount and cause cloudy water.

However, the best way to get rid of algae still involves scrubbing and vacuuming, before killing it with a chlorine shock. Plus, if the algae are full green, yellow, or black, using too much algaecide is no longer effective. Not only expensive, too much algaecide can cause foaming and the deposit copper metal in the water.

Compared to liquid chlorine, algaecide only works on minor amounts of algae, not an outbreak.

Other Things to Note Down

You beloved swimming pool water may appear cloudy or milky after shocking the pool, which is actually normal. Just simply wait it out for a day for the water to clear up it self.

Well now you know what causes your swimming pool water becomes so cloudy.

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