How can I reduce the alkalinity of the pool

Increase Ta value / pool alkalinity in 5 steps (instructions)

Last updated: November 11, 2020

When the sparkling cool water of the garden pool exerts an almost magical attraction on large and small water rats in the summer months, it is essential for pool owners to consider the basic parameters of pool and water care.

In addition to physical cleaning carried out at regular intervals, the use of chemical agents to influence the properties of the pool water plays a significant role, including chlorine as a disinfectant.

An essential factor that is wrongly equated with the pH value in a large number of cases is the so-called alkalinity, which helps to prevent fluctuations in the same and thus to ensure that the chemicals used for water care generally function well .

In the event that the alkalinity of the pool in question is too low, it should be increased promptly. If the Ta value is too high, you have to lower the alkalinity.

In the following sections not only the necessary steps are explained, but also, among other things, why a lower TA value should urgently be increased.

Reasons Why You Should Increase Your Pool Alkalinity

As soon as the pool alkalinity is below the range of 80 ppm (parts per million or milligrams per liter), it is considered to be too low and can, for example, result in very rapid changes in the pH value after the swimming pool has been put into operation, for example or other additional chemical agents have been added.

An ideally set pH value, however, represents the basis for a balanced pool chemistry, which is why without this the adequate mode of action of other chemicals cannot necessarily be assumed. In order to avoid both health risks and damage to the components of the pool, it is therefore essential to increase the TA value as quickly as possible, provided that it is too low.

Why is the alkalinity in the pool too low?

If the alkalinity of the pool water in your own garden is too low, there can be a number of reasons, and these always depend a little on the external circumstances.

Due to the fact that the pH value and the TA value are often, but not necessarily necessarily, related to each other, a lowering of the pH value through, for example, the frequent use of pH-Minus, the occurrence of heavy rains as well Acid rain and too many human body fluids, including urine and sweat, usually also result in too low an alkalinity.

Furthermore, the increased use of chlorine in tablet form, unlike shock or shock chlorination with a corresponding pool shocker, is also not beneficial for the TA value of the pool water.

Effects of too low a Ta value

The optimal TA value cannot be seen independently of the individual conditions on site, so that local factors always play a decisive role here, but this should be in a range of at least 80 ppm and at most 160 ppm (parts per million or milligrams per Liters) to ensure that the chemical properties of the water are correspondingly stable or remain so.

A value below 80 ppm is therefore generally considered to be too low and in many cases has unpleasant side effects, including constant fluctuations in the pH value, followed by infestation with algae, which settle as a greenish area in the respective swimming pool as well as increased corrosion of the built-in materials and pool accessories.

In addition, it is entirely conceivable that this so-called condition of over-acidification of the pool water can cause additional irritation of the skin or the eyes or burns of the surfaces that come into contact with the water.

Increase the pool Ta value step-by-step (instructions)

So that the sometimes very protracted, costly and labor-intensive effects of a too low alkalinity do not even occur in a serious way, it is recommended to increase the TA value accordingly.

Apart from a few special features with regard to the respective situation on site, the individual information provided by the manufacturer as well as possible deviating properties of the built-in material of the swimming pool, there are, however, some work steps that should be carried out in most cases, which is why these are described in more detail in the following text sections to be discribed.

Step 1: measure pool alkalinity

There are a few different methods to determine the TA value of the respective water, whereby these depend on the one hand on a personal preference and on the other hand also on the desired financial expenditure for the purchase.

In order to be able to measure the pool alkalinity as precisely as possible, you can use, for example, simple test strips as well as specially assembled kits or digital measuring devices that display the result on a screen.

In the event that the determined TA value is below 80 ppm (parts per million or milligrams per liter), it is necessary to increase it immediately.

Step 2: decide on a product

Various aids are available to increase the alkalinity of the water in a pool, with so-called alkalinity siphons being very popular, the production of which is being promoted by companies such as Leisure Time, Chemoform and Bayrol.

A mostly cheaper variant is the use of pure sodium bicarbonate in the form of baking soda, although this is not a professional product, but in any case, for example, sodium carbonate, which is known under the name of soda, is preferable.

That often serves to increase the pH value and sometimes also causes cloudiness of the pool water.

Step 3: Calculate the required amount

Although you should always take into account the corresponding operating instructions for the respective product with the individual information provided by the manufacturer with regard to the dosage, it is often necessary to determine the volume of the swimming pool in order to calculate the amount of chemicals.

Usually around 180 to 300 grams of the respective products per 10 cubic meters of pool volume increase the alkalinity or the TA value by around 10 to 20 ppm (parts per million or milligrams per liter).

If there are special circumstances such as unusual weather conditions or the like, it is advisable to discuss this with other pool owners or a specialist.

Step 4: prepare the product

In most cases, a bucket that has been cleaned of foreign bodies is sufficient to dissolve the selected granulate, the preferred powder or the corresponding liquid concentrate before adding it to the pool water.

Although it can also happen that some products can already be added to the pool water in their pure form, this is usually not recommended, which is why you should definitely consult the instructions of the respective manufacturer before performing this step in order to avoid damage to avoid on the components of the swimming pool.

Step 5: add the product to the water

The addition of the appropriate agent should always go hand in hand with the commissioning of the respective filter pump, which then has to run for several hours so that the chemical agent is sufficiently distributed in the individual pool.

It is also advisable to add the selected product slowly and at different points in the pool to the water of the pool in order to continue to support the greatest possible efficiency.


The handling of chemical agents requires some practice or routine and is, despite everything, a sensible investment of time for future hygienic and visually flawless bathing pleasure.

To ensure that the properties of the pool water remain at a stable level so that there are no undesirable side effects such as algae in the pool, it is important to restore a TA value that is too low as soon as possible by using an appropriate tool, taking into account the steps above increase.

So nothing stands in the way of carefree summer bathing fun in your own swimming pool for big and small water rats.

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