How Much Baking Soda to Raise Alkalinity in Your Hot Tub


Nothing compares with bathing in a hot bath and sitting on them for a while turning your yard into paradise of relaxation. Nonetheless, proper water control should be observed in order for it to be safe. A critical component of water chemistry in the hot tub is alkalinity. Lastly, in this complete guide, we shall be focusing on the use of soda as a means of increasing the alkalinity of your hot tub. However, we will outline a guided procedure of doing that stress free. We will also cover the scientific issues that make sure your spa water remain its nice blue color all the time. In addition, we will try and respond to some of the Frequently Asked Questions about it:

Can baking soda make hot tubs more alkaline?

Also, there is soda (sodium bicarbonate) for the other necessary home material.

Alkalinity remains the cheapest common water additive that makes sense to many hot tub owners.

Let’s explore how baking soda works in this context:

Understanding Alkalinity:

Alkalinity, or how pH does not change, in water.

In hot tubs, maintaining appropriate alkalinity levels is crucial for several reasons:

  • pH Stability: Alkalinity ensures that pH does not change radically. Such sudden increases and decreases in pH tend to be uncomfortable and sometimes cause rusting/corrosion.
  • Water Clarity: It is of utmost importance, because it contributes to the maintenance of transparency by preventing mineral deposits (“water spots”).
  • Sanitation: For example, alkalinity impedes the job of disinfectants like chorine and bromine that we use in treating water.
  • Comfort: Hot tub alkalinity must be balanced in order to make its use better, easy and enjoyable.
    What quantity of baking soda is necessary to increase pH?

How much baking soda you should put so that alkalinity rises is very important and depends on many factors.

  1. Hot Tub Size: The first factor you need to consider is the nature and capacity of your hot tub. The smaller the tub, the lesser amount of baking soda it requires.
  2. Current Alkalinity Levels: The amount of baking soda required depends on the current alkalinity levels in your hot tub. Take samples of the water and analyze it to find out where you started off with.
  3. Target Alkalinity Range: Hot tubs normally have an ideal limit of alkalinity that ranges from 80-120. However, this range is dependent on how you own particular Hot Tub and what types of chemicals you employ.

You simply need to apply some formula that involves the volume of your hot tub versus your desired increase in alkalinity in order to determine how much baking soda is needed. Follow these steps:

Step 1: Test Your Water

To make such adjustments, however, you need to obtain correct measurements of the current hot tub’s alkalinity level first. There is no need for you to spend a lot of money on that because in such pool stores you can find simple test strips or a liquid test kit is also very easy. Ensure that you achieve the most accurate outcomes by following the manufacturer’s directions.

Step 2: Calculate the Required Amount

After getting the test, determine the amount of baking soda required to increase the alkalinity level. The formula is as follows:

(Desired Alkalinity – Current Alkalinity) x (Gallons of water/10,000) x 1.5 [Amount of Baking Soda in pounds]

In this formula:

  • Desired alkalinity is aimed at desirable level of alkalinity.
  • The value you got from the test is known as current alkalinity.
  • By gallons of water, here we mean the maximum amount of water needed for your hot tub.
    Let’s illustrate this formula with an example:
    For instance, if your hot tub contains 1,000 gallons of water, and your present alkalinity is 60 ppm.
    Your TA is 100 ppm. Using the formula:

1.5 pound ×[(100 – 60)]/[10,000/1,000]

To bring down the alkalinity to an acceptable level, you’ll require about six more pounds of baking soda.

Step 3: When you go for hot tub, add baking soda.

Having established the recommended amounts of baking soda, its time now to sprinkle it in your hot tub. Follow these steps for a successful adjustment:

  • Turn off: Turn of the jets and circulation before making any changes to a hot tub.
  • Sprinkle Baking Soda Evenly: Sprinkle the measured amount of baking soda over the water’s surface. Distribution and dissolution are made sure through this.
  • Use a Gentle Brush or Skimmer: Use a pool skimmer or a soft brush to mix in the soda and distribute it evenly.
  • Circulate the Water: Make sure that you have turned on the hot tub so that the water will have time to circulate as well. The baking soda should be allowed to dissolve in the water after a few hours. ascertaining that, they are waiting for it takes some time

Step 4: Re-Test and Adjust

Following the movement and distributing of the baking soda to the water, it is necessary to recheck the hot tub’s alkalinity. It assists you to affirm that the hike is done as should be expected and rectify in case you fail to attain the range stipulated.

Step 5: Wait and Re-Test

When it comes to changing hot tub water chemistry, patience is essential. Allow your system some time, at least 24 hours, between every addition of baking soda so as to observe fully their effect onto alkalinity readings. The wait period prevents overcorrection & helps stabilize water chemistry environment..

Is it alright to use baking soda in a hot tub/bathtub?”

This is a right way of raising alakilnity in your hot pool using some of baking soda. Baking soda is a mild and non-toxic chemical that will not damage your hot tub’s parts or your body. Here are some key benefits of using baking soda in your hot tub:

  • Affordability: Compared to many other expensive alkalinity increasing additives it is one of cheapest.
  • Availability: Hot tub owners have an easy option – baking soda that they can easily acquire at home.
  • Ease of Use: Baking soda is easily administered and convenient for maintaining alkalinity levels within hot tub.

However, there are a few important considerations to keep in mind:

  • Purity: During selection of baking soda for your hot tub, select an unscented and unflavored product. Look for pure sodium bicarbonate.
  • Dissolution Time: Be patient as baking soda takes its time to dissolve in the water.
  • Test and Measure: Ensure your hot tub water is tested regularly, and alkalinity has been maintained in the required range.

Frequently Asked Questions about Baking Soda in Hot Tubs

Here, we’ll address some common questions related to using baking soda in hot tubs:1. Will baking powder work instead of soda for a hot tub?

Baking powder can’t be utilized to expand the alkalinity of a hot tub. This ought to be finished with baking pop (sodium bicarbonate).

Is it safe if I overdid on the baking soda in my hot tub?

However, excessive addition of baking soda might correct the pH too much hence causing neutralization of the alkalinity.

high levels. This will lead to an increased alkaline beyond the desired limit, in case of adding too much. This calls for letting the water return to normal by itself. Regular tests will allow you to control the process and add more or less water in a hot tub depending on the result.

What is the frequency of testing hot tub’s water alkalinity?

It is usually recommended to check up your hot tub’s alkalinity levels in order to keep a proper balance. However, it might also depend on frequency of use and water quality indicators that will change and consequently need testing.

Is it possible for me to apply baking soda on my hot tub that contains acidic water?

If your hot tub water has acidic content higher than standard level, then you can use baking soda to increase the value of alkalinity. Baking soda not only raises alkalinity but also assists in regulating excessively low or acidic pH.

Aside its, what else can change water chemistry in a hot tub?

Hot tub water chemistry also involves keeping the correct balance. Others include pH, chlorine or bromine, calcium Hardness and TDS. It is essential to maintain balance between these factors by periodically testing them to ensure that your hot tub remains clean, safe for use and comfortable.


Maintaining the right alkalinity in your hot tub is essential for water quality and your overall enjoyment. Baking soda, with its affordability and availability, serves as a valuable tool to increase alkalinity safely. By following the guidelines provided in this article, you can confidently adjust your hot tub’s alkalinity levels, ensuring the water remains clear and comfortable. Remember to test and measure regularly, as well as to exercise patience during the adjustment process. With a well-balanced alkalinity level, you can enjoy your hot tub to the fullest, knowing that your water is clean, safe, and ready for relaxation.

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