How Often Should You Put Chemicals In A Hot Tub in 2025?

The frequency of adding chemicals to a hot tub depends on various factors such as the volume of water, usage frequency, and the number of users. However, it is generally recommended to check and adjust the chemical levels in your hot tub at least once a week. This ensures that the water remains clean, balanced, and safe for use.

Chemicals commonly used in hot tubs include chlorine or bromine, pH adjusters, and alkalinity balancers. Chlorine or bromine is added to kill bacteria, viruses, and other microorganisms that can thrive in warm water. pH adjusters help maintain the ideal pH level in the water, which should ideally be between 7.2 and 7.8. Balancing the alkalinity is also important to ensure stable pH levels and prevent fluctuations, which can cause skin and eye irritation.

In addition to weekly maintenance, it is crucial to check and adjust chemical levels after heavy usage, such as when several people have used the hot tub or when contaminants like dirt, lotions, or oils enter the water. You may need to add chemicals more frequently in such cases to maintain optimal water quality.

Regularly testing the water's chemical levels using test strips or liquid testing kits is necessary to determine the appropriate amount of chemicals required. Follow the instructions provided with the products and consult your hot tub manufacturer's guidelines for specific recommendations. Overall, maintaining proper chemical balance and cleanliness is essential for the longevity of your hot tub and to ensure a safe and enjoyable soaking experience.

Best Hot Tubs of 2025

Rating is 5 out of 5

MSPA, Oslo, Frame Series, Fixed Body, Movable, Hot Tub & Spa, Wi-Fi, App Controlled, Jets & Bubble System – 6 Person

EASY ASSEMBLY: Plug & play system & simple 4 easy screws on 4 corners, no tools required and rest is all plug in modules. Hard Body frame with Rhino Tech 6 layer reinforced PVC inner liner
WI-FI ENABLED & APP CONTROLLED: Say goodbye to the days of reaching over your spa or worse having to get out of your relaxing soak just to change some settings. Have full control of your MSpa at all times right at your fingertips. Enjoy the easiest operation and usability through our intuitive UI. Easily receive tips, notices, and alarm messages on the go so you’re always in the loop.
OLED TOUCH SCREEN: All your spa controls in one convenient unit! Easily control your spa from your easy to use control center. Our newest all-in-one control box now features a protective cover to shield from harsh outdoor elements such as direct sunlight and extreme weather conditions.
HYDROMASSAGE JETS PLUS: Going beyond just comfort, hydromassage provides amazing health benefits for your mental and physical health. Enjoy an immersive at home experience that has been shown to relieve muscle soreness and tension, soothe minor aches and pains, and reduce stress and anxiety.
LED LIGHT - LIGHT UP THE NIGHT: Take your spa experience to the next level with beautiful lighting. Our light up spas feature an LED light strip at the bottom to make your spa GLOW. Translucent fabric elements allow beautiful patterns to shine through for a truly romantic environment for your evening soaks. Switch colors based on your mood and enjoy late into the night.
REVOLUTIONARY FIXED BODY: HOT TUB & SPA option for houses, apartments, buildings, or tight spaces that does not have access to move a normal Fixed Frame Hot Tub over the roof.
SMART FILTRATION: To ensure the best quality of water in the spa, the filter cartridge is suggested to be cleaned after each use and replaced every 3-5 days. Feel hard to follow the tips each time? Don’t worry there will be a reminder popping up at least once a week when spa keeps working.
ALL-AROUND BUBBLING DESIGN: 360° air jet system fills the spa with thousands of bubbles, staggered jets push bubbles into the center of the spa creating a balanced, all-encompassing body massage.
ANTI-ICING SYSTEM: When the water temperature is lower than 1°C (33.8°F), the heater runs automatically until the water is heated up to 3°C (37.4°F). This will help prevent water from freezing. The circulation system, pump, and pipe will be saved.

Buy It Now

Rating is 4.9 out of 5

Life Smart LS100 Taupe 4 Person Plug and Play Thermal Friction Heating Square Hot Tub Spa with 13 Jets, Black Cover, & Multi Color LED Lighting System

Provides relaxation at the touch of a button for up to 4 people with the convenient digital command center with a quick assembly; Includes lightweight polyester cover that resists abrasions and is less prone to fading from the sun
Pampering yourself is easy with the 13 hydrotherapy high-powered jets with an underwater, multi-color LED light system, giving you the ultimate spa experience
Energy efficient and exceeds California Energy Commission mandates for hot tub energy consumption, so there is no need to turn the temperature down while not in use
Innovative thermal friction heating system eliminates the need for a separate heater with full-foam insulation, and the included thermal locking cover will keep the heat in
Water capacity of 205 gallons with an exterior of 70 inches long, 61 inches wide, and 32 inches tall, while the interior measures 57 inches wide and 28 inches tall

Buy It Now

Rating is 4.8 out of 5

4 PERSON HOT TUB 1200W HEATER - ALEKO Inflatable Hot Tub with hot tub accessories heats up to 104°F at 5°/hr. Easy 5 minute set up with automatic inflation hose. Portable hot tub is cleaner and hotter with included tub cover (polyurethane).
AUTOMATIC INFLATION, EASY SETUP - ALEKO 4 Person Inflatable Hot Tub features push-button automatic inflation, easily portable. Inflatable tub heats quickly with powerful hot tub heater and tub cover. ALEKO Outdoor Hot Tubs remain clean with inflatable pool filter (x3).
ALL MATERIALS INCLUDED: ALEKO 160 Gallon Tub (5' x 5' x 2' feet), fitted polyurethane cover to maintain heat, inflation hose, 3 filters, 1 filter cover, ground cloth, rubber plug, repair kit, 1200W Heater, 1800W (110-120V) power pack, 600W bubbler, 120 Volt AC filter pump. Connect directly to outlet for best results.
DIGITAL PANEL, BUBBLER JETS - ALEKO Portable Hot Tub features massaging jet bubbles, temperature control, and inflation on easy to use digital panel. Upgrade to ALEKO home spa and tub for convenient use all year long, for travel and vacations, customer support and premium quality.
ELEGANCE AND QUALITY - ALEKO 4 Person Inflatable Hot Tub provides long lasting service for your family. We stand behind the Amazon 30-day money-back guarantee. Customer service available to assist with shipment, delivery, measurement, install, and tech support needs.
ALEKO does not ship Inflatable Hot Tubs to residents of California, due to state requirements for energy efficiency.

Buy It Now

Rating is 4.7 out of 5

Intex 28481E Simple Spa 77 Inch x 26 Inch 4 Person Outdoor Portable Inflatable Round Heated Hot Tub with 100 Bubble Jets, Carry Bag, and Cover, Gray

Pamper and treat yourself with the 100 soothing high-powered jets that give you the ultimate spa experience in relaxing water up to 104 degrees Fahrenheit
Round 77 by 26-inch above-ground blow-up tub provides relaxation at the touch of a button for up to 4 people with the easy-to-use tilt-adjustable control panel
Spa for adults has a built-in hard water treatment system ensures a gentle feeling on skin, clothes, and the entire spa system; Water capacity: 210 gallons
Includes insulated cover, heater/blower system, 2 filter cartridges, thermal ground cloth, inflation hose, carry bag, floating chlorine dispenser, and test strip
Disclaimer: This item requires 28523E energy efficient cover for purchases shipped to California, if not, the order is subject to be canceled due to shipping restrictions

Buy It Now

Rating is 4.6 out of 5

Bestway Miami SaluSpa 2 to 4 Person Inflatable Round Outdoor Hot Tub Spa with 140 Soothing AirJets, Filter Cartridges, Pump, & Insulated Cover, Black

Round 2 to 4-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration
Built-in AirJet system with 140 jets releases warm air into the water, while the digital control panel adjusts the temperature up to 104 degrees Fahrenheit
Features a FreezeShield automatic heating function to prevent inner components from freezing during colder temperatures to ensure long-lasting use
Includes a pump, an insulated cover, cupholders, ChemConnect dispenser to main clean water, filter cartridges, and repair patch
Constructed of durable DuraPlus materials with cushioned, comforting floors and a convenient drain valve for ultimate stability; Dimensions (L x W x H): 71 x 71 x 26 inches

Buy It Now

Rating is 4.5 out of 5

RELXTIME 73in x 73in 4-6 Person Inflatable Hot Tub Spa, AirJet Outdoor Portable Hottub with 130 Bubble Jets, Filter Cartridges, Insulated Cover, Grey

RELAXING INFLATABLE SPA: Square 4 to 6-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration. Using a touch digital control panel, easy to inflate & deflate
DURABLE & INNOVATIVE CONSTRUCTION: The spa's durable PVC material and beam construction offer superior strength and stability while ensuring your inflatable spa never loses its shape
ENERGY EFFICIENT SPA COVER: Inflatable cover provides extra insulation and minimizes heat loss; this cover will help protect your Hot Tub from rainwater pooling
FREEZE PROTECTION: Freeze protection automatic heating function prevents inner components from freezing, you can use your inflatable spa in colder temperatures
ACCESSORIES: 1 pool cover, 1 inflatable caover, 4 seat cushions, 2 filter cartridges & 2 covers, 20 strips water testing, 2 PVC patches, 1 spanner, 1 inflation hose, 1 air valve cap, 1x way valve, 1 x barometer, 1 drainage bung, 2 child safety key, 1 power cable, 1 storage bag, 1 instruction manual.

Buy It Now

Rating is 4.4 out of 5

Intex SimpleSpa Bubble Massage 4 Person Inflatable Round Hot Tub Relaxing Outdoor Water Spa with Soothing Jets, Insulated Cover, and Storage Bag, Gray

Inflatable hot tub offers relaxation in comfort with 100 soothing high-powered jets for a refreshing massage and an ultimate spa experience
Features an all-in-1 control unit to adjust the heating system to suit personal preferences of water temperatures
Accommodates up to 4 people with a convenient cup holder, a floating chemical dispenser, and 2 easy-to-replace filter cartridges for cleaner water
Sturdy horizontal beam construction for stability that withstands outdoor elements for long-lasting use with a water capacity of 210 gallons
Includes an insulated cover to minimize heat loss, a thermal ground cloth, and a carry bag for easy storage; Dimensions (L x W x H): 77 x 77 x 26 inches

Buy It Now

Rating is 4.3 out of 5

Bestway Helsinki SaluSpa 7 Person Inflatable Outdoor Hot Tub Spa with 180 Soothing AirJets, Filter Cartridges, Pump, and Insulated Cover, Brown Wood

ATTENTION: Shipping restrictions may apply. This model is not available for sale in the following states: CA, MA, ME, NJ, NV, NY, OR, RI. Residents of these states may select the comparable Bestway model sold with energy-efficient EnergySense thermal cover to avoid cancellation.
Round 5 to 7-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration
Built-in AirJet system with 180 jets releases warm air into the water, while the digital control panel adjusts the temperature up to 104 degrees Fahrenheit
Features a FreezeShield automatic heating function to prevent inner components from freezing during colder temperatures to ensure long-lasting use
Constructed of durable drop stitch material that provides rigidity while still being lightweight for easy portability when deflated
Includes a pump, an insulated cover, cupholders, a ChemConnect dispenser to main clean water, a filter cartridge, and a repair patch

Buy It Now

Rating is 4.2 out of 5

Jleisure Avenli Aegean 1,200 Liter 65 inch 6 Person Portable Rigid Foam Wall Hot Tub Spa with Insulated Cover and Floor Protector, Black

Rigid Foam Spa measures 65 inches long, 65 inches wide, and 27 inches tall, the ideal size for up to 6 adults
Insulated foam walls act as an insulator and retain the heat whilst the Tri-Tech PVC material provides a durable shell for durability and longevity
Features 90 bubble jet holes and a 104-degree Fahrenheit rapid heating system for longer and more comfortable spa relaxation anytime
Digitally controlled pump for a user-friendly operation; Note, filter and filter cartridge are located in the back pocket of the pump
Includes insulated top cover with double-locking safety clips, floor protector, pump unit, 2 filter cartridges, flexible inflation hose, and repair patch

Buy It Now

Rating is 4.1 out of 5

INTEX 28441EP PureSpa Greywood Deluxe Spa Set: Includes Energy Efficient Spa Cover – Spa Control App – Wireless Control Panel – 6 Person Capacity – 85" x 28"

✔ FIBER-TECH BEAM CONSTRUCTION – Innovative Fiber-Tech Technology offers superior structural stability while maintaining a comfortable surface for a luxorious and refreshing spa experience
✔ THE ULTIMATE SPA EXPERIENCE – Control all Spa functions from your phone or tablet; program Spa use and maintenance remotely with WIFI connectivity; available on App Store and Google Play App
✔ REMOVABLE WIRELESS CONTROL PANEL – The Greystone Deluxe PureSpa includes a removable wireless control panel that features integrated wireless charging; 48 hours of operation on a single charge and conveniently attaches to top of the tub
✔ ENERGY EFFICIENT SPA COVER – High density thermal-resistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50%
✔ PREMIUM ACCESSORIES – Everything you need for pure relaxation! Let your worries bubble away with 2 contoured headrests and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)
✔ CUSTOMER SATISFACTION – Our dedicated customer service team is available via phone, chat, or email to help with any questions you may have on use, installation, or service needs; INTEX's 1-Year Manufacturer Limited Warranty gives you peace of mind

Buy It Now

Rating is 4 out of 5

INTEX 28429EP PureSpa Plus Bubble Massage Spa Set: Includes Energy Efficient Spa Cover – 2 Contoured Headrest – LED Light – 4 Person Capacity – 77" x 28"

✔ FIBER-TECH BEAM CONSTRUCTION – Innovative Fiber-Tech Technology offers superior structural stability while maintaining a comfortable surface for a luxorious and refreshing spa experience
✔ HARD WATER TREATMENT SYSTEM – Built-in Hard Water Treatment System makes water gentler on skin, clothes and the entire spa system; hard water buildup limits water flow and reduces the life of your spa
✔ HEATED AIR BUBBLE TECHNOLOGY – The Positive Temperature Coefficient (PTC) heater is designed to maximize heat transfer to the water, while ensuring the highest level of safety, performance, and longevity
✔ ENERGY EFFICIENT SPA COVER – High density thermal-resistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50%
✔ PREMIUM ACCESSORIES – Everything you need for pure relaxation! Let your worries bubble away with 2 contoured headrests and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)
✔ CUSTOMER SATISFACTION – Our dedicated customer service team is available via phone, chat, or email to help with any questions you may have on use, installation, or service needs; INTEX's 1-Year Manufacturer Limited Warranty gives you peace of mind

Buy It Now

What is the impact of low chemical levels in a hot tub?

Low chemical levels in a hot tub can have several negative impacts, including:

Reduced Sanitation: The primary purpose of chemicals like chlorine or bromine in a hot tub is to disinfect the water, killing bacteria, viruses, and other harmful microorganisms. Low chemical levels can lead to inadequate sanitation, increasing the risk of infections, skin rashes, and waterborne illnesses.
Increased Likelihood of Algae Growth: Insufficient chemical levels can create an environment conducive to algae growth. Algae can turn the water green, create an unpleasant smell, cause clogging of the filter, and make the hot tub less inviting.
Reduced Water Clarity: Proper chemical levels are crucial for maintaining clear and visually appealing water. Low chemical levels can lead to cloudiness or a murky appearance, which can reduce the enjoyment and aesthetics of using the hot tub.
Risk of Contaminant Build-up: Without sufficient chemicals, it becomes easier for contaminants like body oils, sweat, lotions, and other residues to accumulate in the water. This can result in a higher Total Dissolved Solids (TDS) level, potentially impacting water quality and requiring more frequent water changes.
Equipment Damage: Imbalanced chemical levels can lead to corrosion or scaling of the hot tub's equipment, including the pump, heater, jets, and pipes. Over time, this can cause damage, reduce the lifespan of the components, and lead to costly repairs or replacements.
Skin and Eye Irritation: Low chemical levels can affect the pH balance of the water, resulting in acidic or alkaline conditions. Such imbalances can cause skin dryness, irritation, itching, or rashes. Eye redness, stinging, or burning sensations may also occur.
Unpleasant Odor: Inadequate chemical levels can contribute to the growth of bacteria and other microorganisms that emit foul or musty odors. This can make the hot tub experience unpleasant for users.

To ensure a safe and enjoyable hot tub experience, it is essential to maintain proper chemical levels by regularly testing the water and adjusting the chemicals as needed.

What is the impact of insufficient sanitizer in a hot tub?

Insufficient sanitizer in a hot tub can have several negative impacts:

Bacterial growth: Sanitizers like chlorine or bromine are used in hot tubs to kill bacteria and other microorganisms present in the water. If there is not enough sanitizer, bacteria can multiply rapidly, leading to the growth of harmful pathogens. This can increase the risk of waterborne illnesses and infections for people using the hot tub.
Algae growth: Insufficient sanitizer can also result in the growth of algae in a hot tub. Algae are microorganisms that thrive in warm, damp environments. Not only can it make the water appear green and murky, but it can also cause slippery surfaces, foul odors, and skin irritations.
Foul odors: If the sanitizer level is too low, bacteria and other organic matter can accumulate in the water, resulting in unpleasant odors. The hot tub water may have a strong, pungent smell that can make the experience unenjoyable.
Skin and eye irritation: Proper sanitizer levels help maintain a balanced pH and eliminate contaminants that can cause skin and eye irritations. If the sanitizer is insufficient, the water can become unbalanced, leading to dry, itchy skin, rashes, red eyes, and other allergic reactions.
Mechanical damage: Insufficient sanitizer can also have long-term effects on the hot tub's components. Bacteria and algae can build up in the filtration system, plumbing, and other internal components, leading to clogs, reduced efficiency, and even damage to the equipment.

It is crucial to regularly test and maintain the sanitizer levels in a hot tub to ensure the water remains clean, safe, and pleasant for users.

What is the impact of neglecting hot tub chemical maintenance?

Neglecting hot tub chemical maintenance can have several negative impacts, including:

Bacterial and microbial growth: Without proper chemical treatment, the hot tub water can become a breeding ground for various bacteria, algae, and other microorganisms. These can cause unpleasant odors, cloudy and dirty water, and potentially lead to infections or illnesses when people use the hot tub.
Skin irritation and infections: Insufficient chemical maintenance can result in imbalanced pH levels or the presence of harmful contaminants in the water. This can lead to skin irritation, rashes, or even more serious infections.
Damage to the hot tub equipment: Proper chemical maintenance helps prevent the build-up of mineral deposits and the development of corrosive conditions in the hot tub. Neglecting this maintenance may result in the accumulation of scale, clogging of filters, damage to the heating elements or pumps, and potentially expensive repairs.
Decreased longevity of the hot tub: Regular chemical maintenance helps keep the water clean and properly balanced, which reduces the strain on the hot tub components. Neglecting this maintenance can lead to accelerated wear and tear on the equipment, decreasing their lifespan and potentially requiring premature replacement.
Unsafe water conditions: Without the appropriate chemical balance, hot tub water can become contaminated and unsafe for use. This can increase the risk of infections or illnesses for those who enter the hot tub.
Decreased enjoyment and relaxation: The purpose of having a hot tub is often to relax and enjoy the therapeutic benefits it offers. Neglecting the chemical maintenance can result in unpleasant water conditions, reduced water clarity, and foul odors, making it less enjoyable to use the hot tub.

Overall, neglecting hot tub chemical maintenance can adversely affect both the health of the users and the lifespan of the hot tub itself. Therefore, regular monitoring and adjustment of chemical levels are crucial to ensure a safe and enjoyable hot tub experience.

How to adjust the calcium hardness in a hot tub?

To adjust the calcium hardness in a hot tub, follow these steps:

Test the water: Use a water test kit specifically designed for hot tubs to measure the calcium hardness (also known as total hardness) level. The ideal range for calcium hardness in a hot tub is between 150-250 ppm (parts per million).
Determine the required adjustment: If the calcium hardness level is too low, you will need to raise it. If it is too high, you will need to lower it. Based on the current level, determine the required adjustment.
Adjusting calcium hardness if it is too low: Add calcium increaser: If your calcium hardness level is below the recommended range, you can raise it by adding a calcium hardness increaser product specifically designed for hot tubs. Follow the manufacturer's instructions for the appropriate dosage.
Adjusting calcium hardness if it is too high: Use a calcium reducer: If the calcium hardness level is too high, you can lower it by using a calcium reducer product. These products work by binding excess calcium and preventing it from causing scaling or cloudiness in the water. Again, follow the manufacturer's instructions for the proper dosage.
Re-test the water: Allow the water to circulate and balance for a few hours or as recommended by the product instructions. Then, re-test the calcium hardness level to ensure it falls within the desired range.
Repeat if necessary: If the calcium hardness is still not within the recommended range, you may need to repeat the adjustment process until the desired level is achieved.

Regular maintenance and testing of water chemistry is essential for the longevity and proper functioning of the hot tub. It is recommended to consult the owner's manual or seek advice from a pool and spa professional for more specific guidance based on your hot tub's make and model.

How Often Should You Put Chemicals In A Hot Tub?

Best Hot Tubs of 2025

What is the impact of low chemical levels in a hot tub?

What is the impact of insufficient sanitizer in a hot tub?

What is the impact of neglecting hot tub chemical maintenance?

How to adjust the calcium hardness in a hot tub?

Related Posts: