Chemicals for Inflatable Hot Tubs: All You Need To Know

We’ve owned enough inflatable spas to know one truth: water care can either make or break your hot tub experience. Use too many chemicals, and the water turns harsh and uninviting. Use too little, and you're dealing with cloudy water, odors, or worse, damaged spa components.

So how do you strike the right balance?

Whether you’re just unpacking your first inflatable hot tub or you’ve been soaking for years, understanding the right chemical routine is essential.

In this guide, we’ll walk through everything we’ve learned about sanitizing, balancing, and maintaining spa water, including why we eventually stopped relying on traditional chemicals and switched to a mineral-based system that protects both our skin and our spa.

Types of Chemicals Used in Inflatable Hot Tubs

A good starter kit for inflatable hot tubs includes a sanitizer, pH adjusters, shock, test strips, and defoamer. We’ve tested them all, but found that most routines are overly complex. That’s why we now rely on O‑Care, a natural, mineral-based product that replaces multiple chemicals with one simple weekly dose.

Starter Kit Essentials for Inflatable Hot Tubs

Before diving into the details of each hot tub chemical, it helps to know exactly what you need. Here's a simple list of the core products we recommend every inflatable hot tub owner keeps in their starter kit:

Core Chemicals:

• Sanitizer: Chlorine, bromine, or a mineral-based system like O-Care
• pH increaser & pH decreaser: To maintain healthy balance
• Alkalinity increaser: Helps stabilize pH
• Shock treatment: Chlorine or non-chlorine, for oxidizing contaminants

Helpful Tools:

• Water test strips or a digital tester: To check sanitizer, pH, and alkalinity levels
• Defoamer: Optional, for foam control
• Filter cleaner: For monthly deep-cleaning
• Floating dispenser: If you're using tablets

We’ve gone through the full range, from piecing together kits to buying bundled chemical packs. But after years of balancing, measuring, and troubleshooting, we found a better way.

O‑Care replaces most of what’s on this list with a simple, once-a-week treatment. It helps reduce chemical use by up to 78%, keeps the water soft and odor-free, and protects sensitive skin (and spa components) from harsh chemical buildup.

1. Sanitizers for Inflatable Hot Tubs

Sanitizers are key to keeping the water in inflatable hot tubs safe and clear. Without them, bacteria, body oils, and organic contaminants quickly build up, especially in warm, shared water.

Most inflatable spas rely on chlorine, bromine, or a mineral-based system to sanitize the water. Some owners also explore saltwater options, though they require compatible setups and more upkeep.

We’ve seen what happens without proper sanitation: cloudy water, clogged filters, and irritated skin. That’s why we now use a mineral-based solution that keeps water balanced without the harsh effects of traditional spa chemicals.

Here is a list of the most dangerous contaminants found in inflatable spas:

1.1. Chlorine Sanitizer

A chlorine sanitizer works by introducing chlorine particles into the water. Chlorine is a powerful disinfectant. When added to the spa water, it combines with other substances to form chloramine, which is also effective in killing microorganisms.

In inflatable hot tubs, chlorine levels should stay between 1–3 ppm. This ensures there’s enough free chlorine to sanitize without irritating skin or damaging components.

You can use chlorine granules or tablets, placed in a floating dispenser or added directly to the water. Stabilized chlorine is a good option if your spa gets sunlight, as it resists breakdown from UV exposure.

If chlorine levels get too high, dilute the water. If they’re too low, top it up, ideally using a digital tester to stay accurate. Keeping chlorine in check helps avoid odors, irritation, and unnecessary wear on your spa.

For those of us who prefer softer, simpler water care, we’ve found that using O‑Care alongside low levels of chlorine keeps the water balanced with far less effort.

Appropriate Chlorine Levels

It is important to note that the optimal chlorine level may vary depending on three factors:

• The number of people using the hot tub
• The temperature of the water
• The pH level of the water

If this is hard to manage, refer to the manufacturer's instructions or consult a professional. They can determine the appropriate chlorine levels for your specific hot tub.

Chlorine Sanitizer Types for Inflatable Hot Tubs

There are several types of chlorine sanitizers that are commonly used in inflatable hot tubs:

1. Chlorine granules or tablets: These are the most common type of chlorine sanitizers used in hot tubs. They are easy to use and can be added directly to the hot tub water. You can place chlorine granules in a floater or skimmer basket and let them dissolve slowly over time.
2. Stabilized chlorine: This type of chlorine has a stabilizer added to it, which helps to protect it from being broken down by the sun's UV rays. This makes it last longer in the hot tub water and reduces the need for frequent additions.

1.2. Bromine Sanitizer

Bromine sanitizers work by releasing active bromine ions into the water. These ions can then react with microorganisms and other impurities. This results in an oxidation process that prevents them from growing.

Bromine is often used as an alternative to chlorine, as it is more stable in hot water and can provide longer-lasting residual protection. Mixing chlorine and bromine is not recommended.

Bromine sanitizers come in two forms:

1. Bromine tablets and bromine granules, which you can place in a floating dispenser or in a bromine feeder and dissolve over time.
2. Liquid bromine, which you can add directly to the water.

In both forms, the bromine ions will react with other chemicals in the water to form bromamines, which are also effective sanitizers.

According to CDC guidelines, maintaining bromine levels between 3 and 5 ppm is considered safe and effective for sanitizing hot tubs, including inflatable models.

1.3. Mineral Sanitizer

A mineral sanitizer uses a combination of minerals and other natural compounds to sanitize inflatable hot tubs. This system uses natural minerals (silver or copper) to inhibit the growth of microorganisms and other impurities in the water.

Some mineral sanitizers also use other natural compounds, such as citric acid, to balance the pH level of the water.

Mineral sanitizers are an alternative to traditional chemical sanitizers. They are gentler on the skin and eyes.

The mineral sanitizer system usually consists of a mineral cartridge placed in the hot tub. This system works by releasing a low level of ions that inhibit the growth of bacteria and other microorganisms in the water. As a result, you don't need to use as much chlorine or bromine.

We’ve used mineral cartridges in the past and appreciated the softer water feel, but they often required more frequent testing and didn’t always perform well in high-use spas.

Mineral sanitizers:

1. Are not as effective as traditional chemical sanitizers in killing bacteria.
2. Are often used along with chlorine or bromine.
3. May require more frequent testing and maintenance.
4. May not be suitable for all hot tubs

2. PH Balancers

To keep inflatable hot tub water safe and comfortable, the pH should stay between 7.2 and 7.8. If it’s too high or too low, it can cause skin irritation, cloudy water, or damage to your spa. Use test strips and pH balancers to adjust levels as needed.

What Is Hot Tub Water PH?

Hot tub water pH refers to the measure of the acidity or basicity of the water in a hot tub. The pH level is measured on a scale of 0 to 14, with 7 being neutral. A pH level lower than 7 is considered acidic, and a pH level higher than 7 is considered basic.

The pH level measures how acidic or basic your spa water is, and it directly affects both your comfort and your equipment. Water that’s too acidic can corrode components and irritate skin, while overly alkaline water leads to cloudy water and scaling.

We check our pH weekly, especially after refills or heavy use. It only takes a minute with test strips or a digital water tester.

2.1. pH Increaser

If your pH drops below 7.2, it’s time to raise it. This often happens after adding sanitizer or filling your spa with low-alkaline water.

Most pH increasers contain:

• Sodium carbonate (also known as soda ash)
• Sodium hydroxide (a stronger base, used less often)

These compounds neutralize excess acidity and help restore balance.

2.2. pH Decreaser

When the pH climbs above 7.8, you may start seeing cloudy water, reduced sanitizer effectiveness, or scale buildup on your spa walls.

Common pH decreasers include:

• Sodium bisulfate: dry, dissolves quickly, safer to handle
• Muriatic acid: liquid, highly effective, but requires extra care

Both work by introducing mild acids that bring the water back into the optimal range. We prefer sodium bisulfate for most situations: it’s fast, reliable, and less corrosive to handle.

How We Simplify pH Balance

Using O‑Care has noticeably stabilized our pH levels. Because it softens the water and supports overall balance, we spend less time adjusting and more time enjoying the spa.

3. Alkalinity Balancers

Total alkalinity (TA) is a measure of the total amount of alkaline substances in water, which includes:

• Bicarbonates
• Hydroxides
• Other dissolved salts

TA measures water's buffering capacity (ability to resist changes in pH levels).

The ideal alkalinity level in a hot tub is between 80 and 120 ppm. Alkalinity balancers can either increase or decrease the alkalinity level.

When the alkalinity level is too low, add an alkalinity increaser to the water. This is usually sodium bicarbonate, a base that raises the alkalinity levels.

When the alkalinity level is too high, add an alkalinity decreaser. The most common are sodium bisulfate and muriatic acid. These acidic compounds lower the water's alkalinity.

4. Shock Treatments

Shock treatments break down organic contaminants like body oils, lotion, and sweat that build up in inflatable hot tubs. Chlorine shocks work best for deep sanitizing, while non-chlorine options are ideal for routine care. Regular shocking keeps the water clear, reduces odors, and helps maintain chemical balance.

Even when sanitizer levels are stable, hot tubs collect organic waste, from sunscreen to sweat, that traditional sanitizers can’t fully break down. That’s where shock treatments come in. They oxidize these contaminants, helping prevent cloudy water, strong odors, and poor sanitizer performance.

We use shock after heavy use, water changes, or whenever the spa feels off. With the right product, it only takes a few minutes to reset the water chemistry.

Types of Shock for Inflatable Hot Tubs

Chlorine Shock

Chlorine shock is a strong oxidizer that sanitizes water by killing bacteria and breaking down biofilm and algae. It’s best used:

• After draining and refilling the spa
• When water is cloudy or smells like chlorine
• To address algae growth or high bather loads

Always test chlorine levels after shocking to ensure they return to the safe 1–3 ppm range.

Bromine Shock

Bromine shock works similarly to chlorine but tends to produce fewer byproducts. It’s a good option if:

• You’re already using a bromine-based sanitizer
• You want gentler oxidation without harsh odors

Non-Chlorine Shock

Non-chlorine shock is ideal for regular maintenance. It:

• Removes contaminants without raising sanitizer levels
• Doesn’t affect pH or alkalinity
• Can be used just before soaking without long wait times

This is the type of shock we reach for most often. It works quietly in the background and keeps the water clean without overloading it with chemicals.

General Spa Shock Products

Some products are marketed as “spa shock” and may include combinations of oxidizers, buffers, or stabilizers. These typically:

• Support sanitizer efficiency
• Help maintain pH balance
• Reduce foam caused by oils or residue in the jets

How O‑Care Changes the Shock Routine

Because O‑Care reduces organic buildup and helps keep water naturally balanced, we find ourselves needing to shock the water far less often. When we do, we prefer non-chlorine options that align with a gentler spa experience.

5. Other Types of Specialized Hot Tub Chemicals

There are various specialized hot tub chemicals for inflatable hot tub maintenance. These products range from special soaps explicitly designed for inflatable hot tubs to:

• Water clarifiers
• Stain and scale removers
• Foam control products

O‑Care vs. Traditional Hot Tub Chemical Routines

Traditional spa care involves multiple daily and weekly chemical steps to maintain water balance, clarity, and sanitation. With O‑Care, we’ve replaced most of that routine with a single, weekly dose. It reduces the need for chlorine or bromine, softens the water, and protects sensitive skin, all while saving time and effort.

Let’s be honest: traditional spa maintenance can feel like a part-time job.

Between testing strips, adjusting pH, adding shock, checking chlorine levels, and cleaning filters, it’s easy to feel overwhelmed. That’s exactly why we switched to O‑Care. It doesn’t just reduce chemical use; it transforms the entire experience.

Here’s what the routine looked like before, and what it looks like now:

We’ve been through the full routine. We've dealt with the burning eyes, the chlorine smell stuck in our hair, the stained suits, and the cloudy water after missing one step. That all changed with O‑Care.

With just one weekly dose, O‑Care gives us more time soaking and less time stressing.

Why We Recommend O‑Care

• Safe: Reduces harsh chemical exposure (ideal for kids and sensitive skin)
• Soft: Leaves water silky and odorless
• Simple: One weekly task instead of five

It doesn’t just maintain the water. It enhances the whole experience.

Want to switch? Use our store locator to find an O‑Care retailer near you or download the app for step-by-step guidance.

Safety Precautions

Here is a list of safety precautions we recommend for using inflatable hot tub chemicals:

1. Always add chemicals to the hot tub water while it is running to ensure proper mixing and distribution.
2. Avoid adding chemicals to the hot tub water when it is too hot. Hot water can cause the chemicals to evaporate or become too concentrated, which can cause skin irritation or damage to the hot tub equipment.
3. Do not use body oils or lotions in the hot tub before adding chemicals, as these can affect the water's chemical balance.
4. Wear gloves and protective eyewear to avoid skin or eye irritation when handling chemicals.
5. Avoid breathing in fumes from the chemicals and avoid prolonged exposure to the chemicals.
6. Always follow the manufacturer's instructions for adding chemicals to the hot tub water and use the correct amount.
7. Be aware of sensitive skin. To prevent skin irritation, avoid overusing chemicals and test the water before entering.

As O‑Care users, we’ve been able to eliminate much of this complexity. But when we do need to use traditional chemicals, we treat them with the same respect we give to any powerful tool, with care, and never casually.

First-Time Setup for Inflatable Spas

Before using your inflatable hot tub for the first time, clean the shell, fill with fresh water, and balance your water chemistry. This ensures safe, clear water from the start and prevents damage. Adding a product like O‑Care early can make your weekly care much easier.

Here's exactly what we do when starting fresh with a new hot tub:

1. Clean the Shell Before Filling

Wipe down the inside of the spa with a soft cloth and warm water. If the spa was stored or used before, use a hot tub shell cleaner. This prevents contaminants or residue from affecting water quality.

2. Fill with Fresh Water

Use a clean garden hose with a pre-filter if possible (especially if you’re on well water). Fill to the manufacturer’s recommended level. Avoid using softened water, as it can impact calcium balance later.

3. Test and Balance the Water

Once filled, test the water with test strips or a digital tester. Adjust in this order:

• Alkalinity (ideal: 80–120 ppm)
• pH (ideal: 7.2–7.8)
• Sanitizer (chlorine or bromine to start)

Add each chemical one at a time, allowing proper circulation between steps.

4. Add Your Sanitizing System

Whether you choose chlorine, bromine, or minerals, this is the time to add it. When we set up new spas, we prefer to skip the harsh chlorine startup and go straight to O‑Care, which starts working from the first soak. It helps reduce the need for heavy sanitizers and keeps the water soft and odor-free.

5. Run the Jets & Retest

Turn on your jets to mix everything thoroughly. Please wait at least 30 minutes, then retest to ensure the levels are within the recommended range before use.

Pro Tip: Add O‑Care right after balancing your water. It helps stabilize levels faster and reduces the need for chemical tweaking later.

Inflatable Hot Tub Maintenance: Common Problems and Solutions

Even with the best care routine, inflatable hot tubs can develop water quality issues. We’ve seen it all, from cloudy water to scaling on the walls, and we’ve learned how to fix it fast.

Below are the three most common problems we run into, along with the steps we take to correct them.

1. Cloudy Water

Cloudy water usually means something’s off with your water chemistry.

Common causes:

• High pH or total alkalinity
• Not enough sanitizer
• Buildup of body oils or lotions

What we do:

• Test and adjust pH and alkalinity levels
• Add a non-chlorine shock to oxidize organic waste
• Make sure sanitizer levels are back in range
• Clean or rinse filters if needed

2. Algae Growth

Algae doesn’t show up often, but when it does, it can quickly take over. Warm, stagnant water and low sanitizer levels are the perfect recipe.

How we stop it:

• Maintain pH between 7.2 and 7.8, chlorine between 3–5 ppm
• Shock the water and clean the filters
• Run the jets on high for at least 2 hours to circulate water
• Brush down the spa walls and floor to remove growth

Algae makes the hot tub water green, cloudy, and unhygienic, but it’s easy to prevent with steady water care and circulation.

3. Scaling

Scaling appears as white or chalky deposits on the walls, jets, or heater components. It’s caused by high calcium hardness or rising alkalinity.

How we handle it:

• Use a descaling product to dissolve visible buildup
• Adjust pH and alkalinity to stay in the safe range
• Keep calcium levels in check, especially in hard water regions

Over time, scale can wear down components and restrict water flow — which is why we treat it as soon as it shows up.

Our Take

Keeping water clean in an inflatable hot tub doesn’t have to be complicated. We’ve learned that consistent pH and alkalinity balance, plus regular sanitizer and shock use, handles 90% of issues before they start.

If you ever notice a strong chlorine smell, don’t assume your water is clean — it usually means your chlorine levels are too high or reacting with waste. Adjust accordingly, and test before your next soak.

Simplify Inflatable Hot Tub Care With O‑Care

Keeping your inflatable hot tub clean shouldn’t feel like a full-time job. After years of managing test strips, chemical bottles, and imbalances, we switched to O‑Care and never looked back.

O‑Care helps us maintain proper water chemistry with just one weekly dose of natural minerals. It reduces the need for harsh additives by up to 78%, keeps the water soft and clear, and protects both our skin and our spa equipment.

Whether you’re just getting started or tired of juggling multiple products, O‑Care makes it easier to keep your inflatable hot tub clean and your proper water chemistry on track.

If you’re ready to make inflatable spa care safer and simpler, we’re here to help you every step of the way. Find an O-Care retailer near you!

Frequently Asked Questions

1. Can I use regular swimming pool chemicals in my inflatable hot tub?

We do not recommend using regular swimming pool chemicals in an inflatable hot tub. The chemical balance and usage guidelines may differ. We recommend using chemicals specifically designed for inflatable hot tubs to ensure proper balance and safety.

2. How often do I need to add chemicals to my inflatable hot tub?

We recommend testing the chemical levels of your inflatable hot tub at least once a week and adjusting as needed. Add chemicals after heavy use or if you notice any changes in the water quality.

3. How often should I change the water in my inflatable hot tub?

We recommend changing the water in your inflatable hot tub every 3-4 months or sooner, depending on the usage and the number of bathers. Regular testing and maintaining the chemical balance can help extend the time between water changes. It is also important to drain and clean the hot tub at least once a month. Consult the user manual or a professional for more specific guidelines.