How Often Should I Change The Water In My Inflatable Hot Tub?

When you think of enjoying your inflatable hot tub, certain images probably come to mind.  Slipping into the hot bubbling water and leaning back for a deeply satisfying massage.  Maybe an afternoon of family fun time.  Perhaps it’s stretching out in your inflatable spa and enjoying a lazy soak in the evening after a hard, stressful day.

Whatever it is, each image is sure to include crystal clear water. And this is certainly a key aspect of enjoying your inflatable hot tub.


We have already seen in our article Everything you Need To Know About Inflatable Hot Tub Chemicals about how to keep the water sparkly clean with the right use of inflatable hot tub chemicals.

But not only do you have to treat the water, to keep it clean and hygienic, you also need to change the water regularly.

Knowing when to do this can sometimes be a puzzle.  Help is at hand here with our simple guide in answer to the often-asked question: How often should I change the water in my inflatable hot tub?

How To Empty Your Inflatable Hot Tub

Whichever inflatable hot tub you own, changing the water is easy enough.  The precise procedure differs slightly, depending on the model you own, so be sure to check your Owner’s Manual.

These, though, are the basic steps that apply to every inflatable hot tub.

First, you must switch off and unplug the electricity supply to the filter pump.  Then attach a garden hose to the drainage valve, using a hose adaptor if required.  Place the other end of the hose into an area where the old water can drain safely away.  This needs to be away from flowers, plants, and grass, as the chemicals in the hot tub water can harm these.

Next, undo the drainage valve inside the inflatable hot tub, and the water will empty out.

But how often should this be carried out?

How Often To Change The Water In Your Portable Spa

First off, you don’t want or need to change the water too frequently.  This will send your water – and your heating – bills through the roof.

On the other hand, you also don’t want to leave the water in your inflatable hot tub for too long, as you will end up soaking in hot water that is dirty and potentially unhygienic and unsafe.

Getting the balance right between too-often and not-enough is a bit like trying to balance a seesaw.

Fortunately, there is a general rule which you can use, to help work out when to change the water in your inflatable hot tub.

Take the number of gallons your inflatable hot tub holds, which you’ll find in your owner’s manual or on each of our reviews.  Divide this number by 3. Then take that number and divide it by the number of people who regularly use the hot tub every day. That number shows you how often you should change the water.


Let’s take the Lay Z Spa Paris as an example.

The Lay Z Spa Paris holds 192 gallons. Divide that by 3, and you get 64.  If 2 people use it regularly every day, then 64 divided by 4 equals 32.  This means you need to change the water every 32 days, which is once a month.

This is only a guide of course, and you might find there are times when you need to change the water irrespective of that calculation.

Signs It Is Time To Change The Water In Your Inflatable Hot Tub

These are some of the most important signs to look out for.  They tell you that you need to change the water in your inflatable hot tub as soon as possible.

Cloudy Water

When the water in your hot tub starts to look cloudy, the first thing you need to do is shock it.  See our helpful guide on How To Shock Your Inflatable Hot Tub.

If that doesn’t work, however, then change the water straight away.


The first thing you need to do if the water looks foamy is to use a hot tub de-foamer, such as SpaGuard Spa Anti Foam.

If the foam returns soon after you use the de-foamer, however, then it is time to empty out the water, clean your hot tub, and re-fill it with fresh water.

Spaguard anti foam to clean your inflatable hot tub


Smelly Water

The moment you take the cover of your inflatable hot tub, and notice that the water smells: change the water.  You might find some sites telling you to add chemicals or try some tricks.  But the truth is, you really need to drain the tub and fill it with fresh, clean, odor-free water.


Keep an eye on when you last changed the water in your portable spa. If it has been two months or longer, then it is definitely time to change it.  No matter how fresh it seems.

Remember: there can be bacteria lurking in the water, so it is better to be safe than sorry.

Keeping Your Inflatable Hot Tub Clean

When you change the water in your inflatable hot tub, it is the perfect time to carry out a couple of other simple cleaning tasks.

After you empty the hot tub, give the water filter a good clean. Give the hot tub itself a good clean as well.  We have written a simple guide which covers both of these: How To Clean Your Inflatable Hot Tub.

By carrying out these two tasks, you can relax in the knowledge that everything about your inflatable hot tub is perfectly clean, so the water you add to refill it, will be sparkly clean and fresh from the start.

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