How to Make Pool Water Blue: 9 Steps (with Pictures)

Pool water turns blue because of algae. Algae grow naturally in pools, but sometimes it gets out of control and creates a problem called “pool scum”. This happens when algae start growing too fast or become too thick. If left unchecked, it produces toxins and bacteria that cause problems such as eye irritation and skin rashes.

To prevent this, you can add chemicals to the pool water to kill off the algae. However, some people don’t want to add chemicals to their pool water. They prefer to let nature take its course, and they call this method “natural pool care”. That means adding natural remedies to the pool water to clean it.

Read on to find out 9 methods to turn pool water blue:

9 Methods to turn pool water blue:

Debris and leaves should be removed

1. Debris and leaves should be removed

Start by emptying the skimming basket and use a leaf scooper to remove the bulk of what you find there. Then dump it into a wheel barrel or wheeled trash container. You can do this part by hand or with a push broom. If you don’t want to deal with the mess, hire someone to come out and clean up.

Filter and pump should be cleaned

2. Filter and pump should be cleaned

Empty the strainer basket on the pump now to clear it out. Clean the filter by switching the pump to backwash and running it until the water coming out is less sludgy and matches the color of the pool water.

Use vacuum

3. Use vacuum

Vacuum the pool. If you don’t know how, here’s what you’ll want to do:

  • Turn off the power switch on the pump.
  • Drain the pool.
  • Turn on the power switch again.
  • Let the pump run while you use a hose attachment to suck up the debris and dirt from the bottom of the swimming pool.

During this process, you’ll probably need to empty the filter basket every time.

If you’re working alone, try to finish the job within about 30 minutes; however, if there’s someone else in the house, make sure he or she doesn’t come home early. This could cause a big mess.

It is necessary to chlorinate the water

4. It is necessary to chlorinate the water

Chlorine kills bacteria and algae in swimming pools. To do that, you add it to the water.

If you’re dealing with a small backyard pool, you might want to take a few precautions. First, make sure there aren’t any live animals around. Then, look out for frogs and turtles. They don’t like being dunked into the pool. So, scoop them up with a leaf scooper and transfer them to a nearby pond. You’ll need to find a pond or lake where they won’t drown.

Once you’ve got the animals out of the way, it’s time to distribute the chlorine. Start with the bottom of the pool. Pour some of the solutions into a bucket and stir with a stick. Use enough to cover the bottom of the pool, about one gallon per 10 square feet.

Next, work your way toward the middle of the pool. Again, pour some solutions into another bucket and stir with a long pole. This time, you’ll need to use about half a gallon per 10 square feet of the pool area.

Finally, go to the very top of the pool and pour the rest of the solution into a third bucket. Stir it well. Now, you’re ready to add chlorine to the pool.

To do that, you’ll need to dissolve the chemical in a bucket of water. Follow the instructions on the package to determine how much to use. Some products say to mix 2 parts chlorine with 5 parts water. Other packages suggest mixing 4 parts chlorine with 8 parts water. Whichever method you choose, follow the manufacturer’s recommendations carefully.

Vacuum and scoop

5. Vacuum and scoop

When you leave the pool for a week, the chemicals will start breaking up the leaves and sediment, causing the water to become cloudy. With the leaf scoop, you can remove some of it that float to the top.

As the season progresses, it’s time to vacuum again. Vacuum the pool thoroughly after setting the pump to waste. You should ensure that the chemicals don’t drain your plants, trees, or lawns.

Ensure you have removed all debris from your pool and then fill it with fresh water. Empty the skimmer basket after it has been filled with fresh water.

6. Maintain your vehicle regularly

Using the pump regularly is the best way to maintain the quality of the water. You can use a timer if you want it to run for the correct time each day. The pool water and system must first be backwashed frequently.

The side and steps of the pool should be brushed clean with a pool brush, after which the flocculent should be broadcast onto the surface. As debris falls to the bottom, flocculent can vacuum up any debris suspended in the water. To prevent algae growth, add algaecide.

An automatic pool cleaner can clean the pool further once the water has reached a reasonable condition.

Ensure your local pool shop conducts a pH test on the water before swimming.

Too much acidity or alkalinity is detrimental, so you should read your pH reading carefully. Acidity indicates low pH, while alkalinity indicates high pH. Water can be made bath-ready by adding anything the technicians recommend.

Putting some waterproof sunscreen on and blowing up that giant inflatable swan is now the only thing left to do, so sit back and relax.

Check the Levels of Your Pool Water

7. Check the Levels of Your Pool Water

  • Once you have a bucket, a container to hold the water, and your pH test strips, it’s time to get testing.
  • The ideal level of pH is between 7.2 and 7.6. If your pool’s pH level is too high or low, this can cause problems like algae growth or staining on the bottom of your pool liner.
  • You should test for pH levels twice per week, at least during summer months (when people are using their pools more often) and once per week during cooler months when people are less likely to be swimming in their pools (but don’t forget about those winter holidays.)

8. Add Chlorine if the pH Level is Low

If the pH level is low, you’ll need to add chlorine. This can be done by adding a chlorine tablet directly into the pool water or by adding bleach at a ratio of 1 cup per 10,000 gallons of water.

Chlorine should be added slowly so it doesn’t shock the pool because this could cause algae growth and even kill your fish if they’re in there. It’s also best to add it in the morning so that it has time to mix with all of the water before nightfall, when people tend to swim most often.

Finally, ensure you add enough liquid chlorine or bleach to raise your levels back up again before using any other chemicals (or natural alternatives) in your pool.

9. Raise the pH Level if it is Too High

If your water is too acidic, you must raise the pH level. To do this, use a pool pH increaser, which can be found at any pool supply store. Be careful not to add anything else that will lower the pH level of your water once it has been raised with a pool pH increase.

Suppose you try and lower your water’s acidity by adding something like baking soda or sodium carbonate. In that case, it will not work and could even be dangerous for swimmers in your pool.

Frequantly Asked Questions:

A cloudy pool can be cleared with baking soda?

Yes. A pool can benefit from baking soda. 

Where can I find crystal clear pool water?

In theory, if your swimming pool is cloudy, you can add chlorine to “shock” it. You can achieve the desired results with chlorine. Depending on the amounts used, it may take a lot of chlorine to clear the pool.

A cloudy pool can be cleared with vinegar, right?

Dip a sponge or soft cloth into a 50/50 vinegar and water solution and scrub the residue away. Test the pool water after using vinegar, and adjust any necessary levels. It’s fine if a little bit gets into the water, but if you’re concerned, test the water after using vinegar.

My pool needs to be shocked; how often?


How will Borax benefit my pool?

Your pool water will be pH-adjusted when you add some borax to it if it has become highly acidic. Algae and bacteria cannot grow in this environment. Protect your sanitizer levels by buffering pH.


The world is a beautiful place, and part of that beauty lies in the oceans and lakes that surround us. But sometimes, it seems like the water could use some help. With these tips, you’ll be able to keep your pool water blue to enjoy its beauty year-round.