Understanding the Basics of Hot Tub Water Hardness
The ability of water to resist the growth of minerals such as calcium and magnesium is known as water hardness. Hot tub water hardness varies and affects the performance and longevity of a hot tub. The ideal range of water hardness for a hot tub is between 150 and 200 ppm (parts per million). It is important to test and monitor the water hardness in a hot tub to make sure it remains in this range.
Factors That Affect Hot Tub Water Hardness
When filling a hot tub, the water hardness of the area where the water is coming from should be taken into account. This is because the source of the water will dictate the required water hardness for the hot tub. Additionally, chemical products used to maintain the hot tub’s cleanliness can also affect the water hardness.
Testing Hot Tub Water Hardness
The easiest way to test the hardness of hot tub water is to use a test kit. Test kits are readily available at local hardware stores or online. It is important to regularly test the water hardness in a hot tub, as this will allow for easier adjustment of the water hardness in the future.
Raising Water Hardness in a Hot Tub
If the water hardness of a hot tub is lower than the ideal range, the following can be done to raise it:
Adding Calcium Chloride
Calcium chloride can be used to raise the water hardness in a hot tub, as it adds calcium to the water. However, it is important to only use it once the water chemistry is balanced and make sure to add small amounts at a time.
Adding Magnesium Chloride
Magnesium chloride can also be added to raise the water hardness in a hot tub. This should also be used with caution and always added in small increments.
Adding Baking Soda
Baking soda can be used to increase the alkalinity of the hot tub water, which in turn can help maintain an optimum water hardness level.
Lowering Water Hardness in a Hot Tub
If the water hardness of a hot tub is higher than the ideal range, the following can be done to lower it:
Decreasing Total Dissolved Solids
The water in a hot tub can be diluted with distilled or reverse osmosis water to reduce the total dissolved solids (TDS) and lower the water hardness.
Phosphates can be added to a hot tub to absorb calcium and magnesium, which helps reduce the water hardness.
Niacin or Vitamin B3 can also be added to a hot tub to help reduce the water hardness by precipitating calcium and magnesium.
People Also Ask
What is considered hard water in a hot tub?
Hard water in a hot tub is considered to be water with a hardness level of 150-200 parts per million (ppm).
Does salt increase water hardness?
Yes, some salts can increase water hardness by releasing calcium and magnesium ions, which can then form insoluble calcium and magnesium salts.
What happens if hot tub water is too hard?
If the hot tub water is too hard, it can lead to scaly buildup on the hot tub walls and plumbing, as well as cause corrosion and deterioration to the hot tub and equipment.
Can you soften hard water in a hot tub?
Yes, hard water in a hot tub can be softened by diluting it with distilled or reverse osmosis water and adding phosphates, niacin, and other water softening agents.
What is the best way to adjust water hardness in a hot tub?
The best way to adjust the water hardness in a hot tub is to use a test kit to measure the current water hardness, and then add the appropriate products to raise or lower the water hardness.
Monitoring and balancing the water hardness in a hot tub is essential for the health and longevity of the hot tub. Understanding the factors that affect the water hardness, and how to test and adjust it accordingly, will help ensure the optimal performance of the hot tub.