Hot Tub Maintenance Tips: Understanding When & Why To Change Your Water

If you own a hot tub, you know how beneficial and fun it can be. You may also know that hot tubs require some care. But did you know that along with adding the right amount of chemicals, you also need to change out the water every so often?

Keeping yourself and your Mesa hot tubs healthy doesn’t have to be a daunting task. It is important to learn how often and how necessary changing out the hot tub water is. 

Hot Tub in an Arizona house

When Should Hot Tub Water Be Changed?

This is an important question and probably one of the main questions you had when learning about changing hot tub water. The answer is fairly simple, though varies depending on a few factors. In general, you should change your hot tub water every three months.

Being a general rule of thumb, there are a few ways of knowing what your specific hot tub requires. To figure this out, we have to use math.

Calculating Frequency Of Hot Tub Water Change

There are two main components you need to know before finding out how often you need to change your hot tub water. These two numbers will be plugged into a mathematical formula that will determine the frequency of water changes.


The first number is your hot tub’s volume. The volume of your specific hot tub can be found in your user manual or by contacting your hot tub manufacturer. You can also follow the below-suggested volume based on how many people your hot tub holds:

  • The 2-person hot tub holds roughly 170 gallons (650 liters)
  • The 4-person hot tub holds roughly 330 gallons (1250 liters)
  • 7 or 8-person hot tub holds roughly between 475 and 610 gallons (1800 and 2300 liters)

Bather Load

Bather load is how many people regularly use your Gilbert hot tub. You might have a 4-person hot tub, but only 2 of you use it frequently. The Bather load doesn’t have to be exact. Simply estimate how many people use your hot tub.

Water Change Formula

You now have everything you need to plug into the formula! The very first step is to divide the volume of your hot tub by 3, then divide that number by your estimated bather load.

  • Hot tub volume ÷ 3 ÷ estimated bather load = Frequency of water change
  • 150 gallons ÷ 3 ÷ 2 bathers = change every 25 days
  • 330 gallons ÷ 3 ÷ 2 bathers = change every 55 days

Remember that this is a guideline. The timing of water changes is determined by your area’s water quality, hot tub location, and how you take care of the water between changes.

You may find yourself in a situation where your hot tub water is cloudy, foamy, or smelly before your required changing time is up. It is important to change the water if this happens and not wait.

Indications Hot Tub Water Should Be Changed

Have you found yourself ready for a relaxing soak and found the water to be cloudy, foamy, or smelly? A soak in water like that is less than relaxing. These symptoms are indications it is time for a change.

Some products may help, like spa shock, foam remover, or adding more chlorine. These products would help, but they may be covering up a deeper issue.  

Thçe best action step you can take in these situations is to change your water. Then, you can relax, knowing your soak will be a clean and healthy one for both you and your Mesa hot tub!

What If The Hot Tub Water Never Gets Changed?

If you want your hot tub to last, stay in good condition, and be healthy for you, changing the water as required will be the best step to take. That said, it is helpful to know more about what happens if a hot tub’s water never gets changed. This way you can have all the information you need to know why it is so important.


Water holds substances and can become oversaturated. For example, when you put calcium chloride in your hot tub, your water is holding some salt. This determines the hardness of the water or calcium hardness. 

If you do not change your hot tub water, the salt might build up over time not allowing added salt to dissolve. Salt buildup may cause scaling on different parts of your hot tub which eventually could damage equipment. 

Total Dissolved Solids

Total Dissolved Solids or TDS are contaminants that build up in the water. These contaminants can be sweat, lotion, makeup, bodily fluids, deodorant, shampoo, etc. Whenever a person soaks in a Gilbert hot tub, some amount of these things are left behind. Thankfully, this is what the sanitizer is for!

That said, sanitizer only works for a time. Eventually, adding sanitizer to rising amounts of TDS without changing the water will cause oversaturation. Oversaturation won’t allow the sanitizer to work and your water may become murky, gritty, and smelly. 

Importance Of Changing Hot Tub Water

Now you have all the information you need to know why it is crucial to change your hot tub water. It is as simple as getting rid of the old, dirty water and filling it up with new, fresh water! 

This simple maintenance step allows you to soak in clean, healthy water as well as prolongs the life of your hot tub. Don’t wait to take the necessary steps so you can enjoy your relaxing Mesa hot tub!

Contact Your Trusted Mesa Hot Tub & Swim Store

If you’re looking for a trusted hot tub retailer or someone who can help you with hot tub maintenance, reach out to AZ Spas & Patio! We value quality tubs, parts, and service and want to ensure that you get the assistance you need!

Our trusted and trained employees want to help you! Contact us today for all your hot tub purchasing and maintenance needs!

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AZ Spas & Patio
7613 E Ray Rd Suite 116
Mesa, AZ 85212

Phone: 480-509-7735
Email: [email protected]