How Often Should You Change Hot Tub Water?

  • By: Adam
  • Date: July 1, 2022

Owning a hot tub can be so much fun. Not only are they great to lounge in during the Summer, as they are heated they can be enjoyed when it is chilly outside. 

They make great additions to house parties and are fantastic to lounge in on your days off.

The only downside to owning a hot tub is the upkeep of it. Similar to a swimming pool, the water in your hot tub will need to be cleaned and changed.

This is something that you should be aware of if you are looking into purchasing a hot tub.

For cleanliness reasons, the water will need to be cleaned fairly regularly. This will help to keep you and other users safe. It will also allow the mechanics of the hot tub to keep running smoothly.

In this article, we will be discussing how often you will need to change hot tub water and the best ways of doing this. 

How Often To Change Hot Tub Water

There is no, one answer that fits all when it comes to how often you should change hot tub water.

The frequency of how often you change it will depend on several different factors.

Size and Capacity

Depending on the size and capacity of your hot tub, the answer can vary quite significantly. 

For example, some hot tubs will need to be changed less frequently than others.

To work out roughly how often your hot tub water needs to be changed, you will need to take into consideration its size. 

Hot tubs are available to purchase in a wide variety of sizes. To give you an idea of sizes, we have listed a few below:

  • Small – 2 people (Around 200 gallons)
  • Medium – 4 people (Around 350 gallons)
  • Large – 8 people (Around 400 – 600 gallons)

As a general rule of thumb, smaller hot tubs should be changed more often because of the lesser water volume.

The buildup of bacteria and chemicals happens a lot quicker with smaller hot tubs.

With larger hot tubs, the process is significantly slower. 

Frequency of Use

The frequency of how often you use your hot tub needs to be taken into consideration when you think about how often the water needs to be changed.

If you are only using the hot tub infrequently, the water will need to be changed less often than if you were using it daily.

In addition to this, the more people that use the hot tub, the quicker the water will need to be changed.

For example, if it is recommended that you change your hot tub water every three to four months, you may need to change it a few weeks earlier than expected if you have had a yard party. 

Do Not Wait Too Long

While there is the temptation to wait a good while to change the water in your hot tub, we would not recommend waiting for more than four months.

While the water may look and seem okay, there may be bacteria lurking in the future that you are unaware of.

Instead of waiting until the hot tub looks like it needs a clean, integrate its cleaning into your cleaning routine on a fairly regular basis.

If the water is unclean, it can be sanitary and unsafe to bathe in. 

Location Of Your Hot Tub

The location of your hot tub can alter how often you need to change the water. For example, if your hot tub is outside it is likely to pick up a lot more dirt and grime in comparison to if it is inside. 

In addition to this, if you forget to cover your hot tub securely, the water quality will decrease a lot quicker.  

The Quality Of The Water Treatment Chemicals 

The type of water treatment chemicals you use in your hot tub can be a big factor in how often your hot tub will need to have its water changed.

If the chemicals are cheap or are not particularly strong, the water quality will decrease quicker.

However, if you purchase a good quality water treatment, it is likely to keep the water cleaner for longer. In addition to this, good quality water treatment chemicals leave little to no residue. 

You may often find that cheaper water treatments will leave a residue in your hot tub. A build-up of this could potentially block parts of the hot tubs such as the jets and filter.

Given this, the water will need to be emptied more often for a thorough cleaning process to take place.

Filtration System

The filtration system of your hot tub will have an overall effect on the cleanliness of your hot tub.

The better the filter, the cleaner your water will be. Not only is it important to empty the water from your hot tub every few months, but it is essential to not neglect cleaning the filter. 

As the filter will catch all of the grime and dirt found in the water, it needs to be cleaned fairly regularly.

If you think about how many people use the hot tub and if they are wearing makeup or sunscreen, this will mix in with the water.

If the filter is not cleaned, this residue will remain in the water and the filter, causing your hot tub water to be unsanitary.  


As you can see, how often you change your hot tub water will vary depending on the size and model you own. As a general rule of thumb, you should change the water around every three months.

However, this is just a guideline and the size of your hot tub and the frequency it is used will affect this. 

Many different factors can affect water quality. This is why it is essential to ensure that you are fully covering your hot tub when it is not in use and you are ensuring to use good quality water treatment.

A clean hot tub filter is essential and you should fully clean your hot tub regularly. The last thing you want is to be bathing in unclean water!