Ascorbic Acid For Swimming Pools – How Does It Help?

Do you know what is Ascorbic Acid For Swimming Pools? If not, then pay attention to the below article.

Have you ever tried to have a nice refreshing time in the swimming pool only to discover that it is too dirty? A dirty swimming pool can be disgusting; there are over 20 million swimming pools in the United States today. Over 50% of these swimming pools are of the above-ground variety because of its affordability and convenience.

A dirty swimming pool is not appealing in any way. Apart from seeing objects such as bugs and leaves or algae that turn the color of the water in the swimming pool into green color, you can also find metal stains along the walls of your pool.

There are many things that can cause these stains in the metal inside the swimming pool; the major cause of the stain comes from the rust created when the iron is introduced into the pool water.ascorbic acid for pools tips

Whenever there is water in your pool, there is always the potential of your pool getting stained. Even a very low level of metal will stain the pool when the condition is right for the stain to form.

This type of stain is mostly caused by 3 types of metals which include;

  • Iron
  • Manganese
  • Copper
These metals can occur naturally; they can also come as a result of the water you use to fill your pool. You are likely to introduce them into your swimming pool when you fill it with hard water or with well water. Metals can also be introduced into your pool when the pool pH alkalinity level is not maintained properly and the water in the pool becomes corrosive.

How to Cure Stains In the Swimming Pool

The first step to cure these stains is to use ascorbic acid in your swimming pool. This acid is also known as vitamin C.

How to treat your pool with ascorbic acid

Below is the instruction to remove the stains in your swimming pool with ascorbic acid:
The first step is to take down the level of chlorine in the pool to at least 7.2. The reason is that too much chlorine in the pool will eat up the ascorbic acid. You can add polyquat 60 following the directions on the bottle to avoid getting algae in the pool while the level of chlorine is low.

The next step is to get your ascorbic acid; you need about half to 1 pound of ascorbic acid per ten thousand gallons. Do not add all the ascorbic acid at once, add small and see if all the stains lift before you add more.

Ascorbic acid that is specifically formulated for swimming pools is available on

Set the filter on circulating. Then using your cup, go around the pool perimeter and pour a small quantity of the ascorbic acid by the sides as you move around the perimeter. When you are done, leave the ascorbic acid to circulate for at least half an hour.

It works like magic; you will be impressed how the stains will disappear before your eyes when this process is completed.

If there are still some stains left, allow the filter to continue circulating after half an hour and also pour more ascorbic acid very close to the area you still see stains.

You should allow it to keep on circulating until all the stains are gone. When you are sure that all the stains are completely gone, you can go ahead and add a sequestering agent to your pool. You can add more, more is better than not enough. When you are done adding the sequestering agents, put the filter back on and leave it on 24/7.

What To Do After Treatment with Ascorbic Acid for swimming pools

When you treat your pool with ascorbic acid, it will bring down the pH level of your pool. In some cases, the alkalinity of the pool will also go down. You can start the process of rebalancing your water after 24 hours; this is to ensure that you bring up the pH and alkalinity of the pool.

how to add ascorbic acid to your poolTo raise both pH and alkalinity – use sodium bicarbonate, also known as baking soda. Occasionally test the water as you carry out this process to ensure that the pH does not go higher than 7.2. If you still need to raise the pool pH when the alkalinity is in range, make use of Borax to raise it up to no higher than 7.2.

You can start to slowly bring up your chlorine when you’ve successfully raised the pH level. This process will take a lot of chlorine. You should watch out for stains during this process, if you see stains forming, add more sequestering agent and make sure that the pH is not higher than 7.2.

Adding more sequestering agents will force the stains to lift in a couple of hours. Ensure that you keep your pH low (7.2) for a week and you do not shock for at least 2 weeks. You will know that you’ve used up the ascorbic acid in the water when your chlorine starts to hold and it will be easy to re-balance the pool back to your normal parameters after that.


Occasionally treating your swimming pool with ascorbic acid is very important if you want a clean and stain-free pool. No one enjoys a swimming pool full of dirt. You can buy some of the best ascorbic acid for swimming pools from major online stores and use them to give your swimming pool a clean and beautiful look and make it healthy as well.

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