How to Treat the Water in Hot Tubs vs Pools

A handful of aspects can influence pool vs. hot tub water chemistry. Although some might assume that the treatment would be similar for both, they will require very different chemicals. There are various reasons why a pool needs different chemicals than a hot tub, and below, we will be going over them all. Here’s what you should know about the top reasons why these two bodies of water should be treated differently.

Hot Tub vs Pool Water Chemical Composition

Although the chemicals used to treat hot tubs and pools might look similar, there are specific aspects that make them better suited for their intended use. When reading the ingredient list of chemicals for pools, for example, there will be a much higher concentration than the ingredients in chemicals made for hot tubs. This has to do with the following factors;

They have different volumes of water

It’s safe to say that pools have a much higher volume of water than hot tubs, and this will, of course, be a factor in how the chemicals are created to treat the water. Since there is much more water that the chemicals will be dispersed through, the concentration will need to be higher than that of a hot tub’s chemicals. This is the first reason why you shouldn’t mix chemicals across different spas or pools. If you decide to use pool chemicals for your hot tub, it will likely be far too strong of a concentration and will quickly cause an imbalance in the water. On the other hand, if you use hot tub chemicals for your pool, you will likely not see much change at all and will ultimately waste chemicals trying to see a change in water chemistry. When it comes down to it, this is one of the main reasons why these chemicals are not interchangeable. Here’s another;

They have different temperatures

The difference in temperature between a pool and hot tub is noteworthy, as one will generally sit around the 80-degree mark while the other can go into the 100s. This temperature change affects how chemicals are created to treat the water, and the evaporation that takes place is also something to keep in mind. Of course, with the higher temperatures of a hot tub comes more evaporation at a quicker pace than we would see in a pool. With this said, however, if you do find that your hot tub is experiencing unstable water levels as a result of this, one of the great things about a spa of this size is that they’re fairly easy to drain and refill. So if your pH levels are constantly off in your hot tub and you’d like to start from scratch, then simply emptying your hot tub and putting fresh wait in is a great option.

They have different jets

While a hot tub will have many different jets that can run at different levels and intensities, pools will generally only have a few to circulate the water around. It makes sense that a hot tub would have more because the massage jets are one of the top features that make them adored by so many. However, with the additional jets also comes a faster distribution of water and, thus, chemicals too. Therefore, once again, if you’re using pool chemicals to treat your hot tub’s water, issues are bound to arise quickly. Not only will the smaller body of water come into play, but the numerous jets that will quickly filter them through the water will instantaneously spike water levels to a point that will likely be difficult to balance once again.

With all this said, it’s safe to conclude that the different chemicals for hot tubs and pools were made for a reason. Although it might be tempting to use them interchangeably, there is ultimately more to lose than gain. This is why we highly recommend ensuring that you choose the proper chemicals for your spa or pool, and should you require help with this, you can reach out to a dealer near you. When it comes down to it, what might work best for one thing won’t work best for another. But by keeping these factors in mind and approaching your hot tub and pool water differently, you can feel confident that you are upkeeping clean, healthy water for all to enjoy.

To learn more about choosing the perfect hot tub for you and your home, download our free buyer’s guide.


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