Pool ascorbic acid: 2 reasons against vitamin C in the pool

Among pool owners, vitamin C is often traded as an insider tip against green water discoloration.

The green color is triggered by algae infestation – and vitamin C is supposed to counteract this.

In practice, it has been shown that there are good reasons against the use of vitamin C (ascorbic acid) in the pool.

Why Vitamin C?

This question is relatively easy to answer. In the short term, h2o ninja mask the ascorbic acid contained in vitamin C in the pool provides a remedy when it comes to annoying discolorations.

These are canceled out by the ascorbic acid – and the water clears up again. This (at least optical) elimination of the problem makes some swear by the administration of vitamin C into the pool.

2 reasons against vitamin C in the pool

#1 Algae growth is favored

For those who have already enriched their pool with ascorbic acid, it will be hard to believe that this will favor algae growth.

And this despite the clear pool water. As mentioned above, vitamin C is primarily used for cosmetic purposes. The pool makes a more hygienic impression due to the clear water.

Nevertheless, the algae continue to grow continuously and spread in the pool. The chlorine content is reduced by vitamin C (more on this later).

Therefore, the algae can grow faster. This shows that this solution only solves the problem in the short term and from a cosmetic point of view. Although the water clears up, algae growth is even accelerated by reducing the chlorine content in the water.

#2 Chlorine is consumed faster

By administering vitamin C into the water, the chlorine consumes much faster – or even disappears completely from the pool water. As already mentioned in the previous point, this circumstance favors the growth of algae, as the natural protective effect of chlorine gradually diminishes.

A much bigger problem in this context is the pathogens that then settle in the pool.

These can cause serious health problems in bathers. Chlorine prevents the spread of pathogens and other pests in the pool very reliably, so the chlorine content must not be reduced to such an extent that the protective effect decreases in such a way.

Vitamin C does not help even with a brown discoloration

Ascorbic acid in the pool also has only cosmetic effects in connection with discoloration caused by iron or manganese.

Vitamin C lowers the pH of the water. Therefore, chemical processes that counteract the discoloration can run better.

The iron or manganese is still in the water afterward. A little later, the process reverses as if by magic and the water is brown again.

Alternatives for the use of vitamin C

Now that it’s clear why it’s not a good idea to put vitamin C in the pool, let’s look at a few alternatives that not only look purely visual and also don’t endanger our health.

#1 Net

With the net, it is possible to fish large leaves, algae accumulations, and Co. directly from the water. This is a quick and cost-effective solution for the obvious dirt in the domestic pool.

#2 Pool vacuum cleaner

In addition to a net, a pool vacuum cleaner should be used at regular intervals to keep the pool clean.

The pool vacuum cleaners are available in three forms as far as operation is concerned. Manual, semi-automatic, and fully automatic. The device then moves through the entire pool and vacuums the floor as well as the walls.

Algae killers

If the problem with the algae cannot be controlled, the use of an algae killer may be a good idea.

The agent must remain in the water for about 24 hours. During this period, the mixture, which is usually based on metal or ammonia, removes the algae from the water.

Subsequently, shock chlorination must be carried out. Shock chlorination is a short-term overdose of chlorine in the pool water.

Through this process, the water is to be completely freed from impurities. In the last step, the circulation pump of the pool ensures that the algae disappear completely from the pool water.


Perhaps the best alternative to using vitamin C as part of pool cleansing is not to let things get that far in the first place. Through reasonable and thorough pool maintenance, a lot can be done in advance.

Nets and suckers should be used even with the smallest traces of algae and Co., then the chance is lower that it comes to a large spread of the pests. Sand filter systems can be installed to make the water even cleaner.

Furthermore, it is recommended to let the pool pump run longer and to carry out backwashes more often. How often the mentioned tools are used depends on the local conditions.

A pool right next to a forest will get dirty faster, like its counterpart in the middle of a new development area. However, it should be said that you prefer to clean your pool too often instead of too rarely.

A pool cover is an absolute “no brainer” and should always be placed over the pool when no one is in the pool bathing. As a result, leaves, insects and the like do not get into the water in the first place – and what is not inside, therefore, does not have to be removed.

The cover keeps the water temperature in the pool constant, especially with regard to colder summer days. Constant water temperatures also have a negative effect on possible algae growth.

If you want it – where do you get the vitamin C, the ascorbic acid for the pool?

Vitamin C is mainly sold in the form of a dietary supplement through drugstores.

This alone should show that the ascorbic acid belongs in the human organism, but not in a swimming pool. Pharmacies and the Internet would be other sources of supply for vitamin C.


Vitamin C has lost nothing in pool water. breath full face mask the stories about the miraculous effects of the vitamin are simply wrong if you take a closer look.

In the case of brown or green water impurities, ascorbic acid only visually eliminates the problem. The unwanted substances are still in the pool water.

Therefore, those affected must switch to other aids. Especially in the case of algae, the use of algae killers is to be mentioned at the forefront.

Preventively, visible impurities can be removed with a net. In addition, it is advisable to have a pool vacuum cleaner drive through the pool at least once a week.

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