Owning a hot tub is like having a slice of paradise right in your backyard – or wherever you have your hot tub! But sometimes there’s trouble in paradise.
Is cloudy, foamy, murky, smelly or green water in your hot tub frustrating you? Or do you struggle with too much, or too little chlorine?
Don’t worry! We’re here with simple solutions to get your hot tub water crystal clear and inviting again.
Hot Tub Problem #1: Cloudy Water
Cloudy water is the most common hot tub water issues. If you struggle with it, you’re not alone!
Causes of Cloudy Hot Tub Water
1. Out of balance water
Unbalanced water in your hot tub can cause cloudy water. Unbalanced water means that one or more of the following levels are outside of range:
- Total Alkalinity: 80 – 120 ppm
- pH: 7.2 – 7.6
- Total Hardness: 150 – 250 ppm
2. Low sanitizer levels (chlorine or bromine)
Whether you use chlorine or bromine, sanitizer helps keep your hot tub water clean and clear. Without sufficient sanitizer levels, your hot tub can be susceptible to bacteria growth, algae and cloudiness.
3. Poor filtration
Clogged, worn or damaged filters can cause bacteria (dead or alive) and debris to accumulate. That means water is not clean. This impacts your hot tub’s water circulation and can lead to a decrease in sanitizer effectiveness.
How to Clear Up Cloudy Water
Ready to clear up that cloudy hot tub water? Follow these steps:
1. Maintain 24-hour circulation
Circulate the water continuously for a 24-hour period to improve filtration and chemical distribution throughout the hot tub.
2. Water balance
Balance your hot tub’s water. Check these levels and correct as needed and in this order:
- Total Alkalinity: 80 – 120 ppm
- pH: 7.2 – 7.6
- Total Hardness: 150 – 250 ppm
Want more details on water balancing? Download our FREE Water Balancing Guide for Hot Tubs.
3. Shock the water
Use a nonchlorine shock like FROG Maintain® to address cloudiness caused by reduced sanitization and filtration issues.
4. Clean filter cartridges
Clean or backwash filters to stop clogs, ensure effective water circulation and promote chemical distribution. Replace them if they’re worn, torn or damaged.
5. Drain and refill
If cloudiness persists, consider draining, purging and refilling the hot tub. This is often needed every 3-4 months, depending on use and your choice of sanitizer. Learn more here!–
Note: Clarifiers temporarily improve water clarity by removing suspended particles, but don’t address the source of the cloudiness.
For persistent issues, ask your local retailer for help. You can always bring a water sample in for testing and recommendations.
How to Prevent Cloudy Water
1. Water testing
Start with regular water testing to ensure your Total Alkalinity, pH, Total Hardness and sanitizer levels are balanced. Test your water regularly and keep on top of any adjustments needed. Balanced water is the key to consistently clean, clear water.
2. Filter care
Make it a habit to clean your filters every few weeks or replace if needed. Proper filtration keeps debris and oils at bay.
3. Cover your hot tub
Cover your hot tub when it’s not in use to prevent debris from entering the water and causing cloudiness. Keep your cover clean – inside and out! Mold and mildew love warm enclosed places, like the inside of your hot tub cover.
4. Shock your hot tub
Regularly shocking your hot tub helps to break down organic matter that might negatively impact water clarity. Use nonchlorine shock to clarify water and check your chlorine levels to make sure they’re within ideal parameters, before and after use.
Follow these steps, and you’ll enjoy crystal, clear water every time.
Hot Tub Problem #2: Foamy Water
Causes of Foamy Water
Hot tub foam occurs when water interacts with air and surfactants, which are compounds that lower the surface tension between liquid and gas and form a barrier that results in foam. As surfactants and air increase, so does bubble formation and ultimately, foam.
So why is foam “bad?” Because of what causes it and what it’s made of:
Common Causes of Foam – Surfactant Build-Up:
1. Oils and lotions
Body oils, deodorants, beauty products and lotions add surfactants to the water, leading to foam build-up over time.
2. Detergents and soap
Residues from detergents and soap on swimsuits and skin contribute to foamy water.
3. Biofilm
This slimy, and often unseen microbial colony attaches to hot tub surfaces, pipes or jets and produces surfactants.
4. Poor water balance
Low Total Hardness (also known as Calcium Hardness) (below 150 ppm) lowers water surface tension and causes foam.
Now that you know the causes of hot tub foam, let’s move on to how to fix it.
Foamy Water Solutions
Here’s how to solve foamy hot tub water:
1. Balance your hot tub water
Start by checking and correcting these levels in this order:
- Total Alkalinity: 80 – 120 ppm
- pH: 7.2 – 7.6
- Total Hardness: 150 – 250 ppm
2. Shock the hot tub
If balancing doesn’t do the trick, and you still have foam, shock the water. Use a nonchlorine shock like FROG Maintain® to oxidize and break down surfactants.
3. Remove oils, lotions, detergents and soap
Add a scum absorber to the water to remove build-up. Multiple absorbers can speed up the process.
4. Address biofilm: drain, rinse and refill
If foam persists, biofilm might be the cause. Here’s how to tackle it: Use a spa purge product. You can also use a biofilm cleaner if needed. Then, drain the tub.
Thoroughly clean the filter, surfaces and pipes with a mild cleaning agent.
Rinse the hot tub to remove any cleaning agent residue.
Refill using a hose filter to avoid new contaminants. After the tub is filled, balance the water and add sanitizer.
Here’s an in-depth guide for hot tub purging: “When It’s Time to Purge Your Hot Tub”
Note: Defoamers are only temporary fixes. For lasting results, follow the 4 steps above.
How to Prevent Foamy Water
If you’ve battled foamy water, you know you don’t want it to be a constant battle.
1. Drain and refill regularly
Drain and refill your hot tub every 2-3 months to remove dissolved solids. If you use FROG® products, you can drain and refill every 4 months. FROG’s mineral cartridge lasts 4 months, plus, you use much less chlorine or bromine with FROG. Also, don’t forget to replace your FROG Mineral Cartridge whenever you drain and refill your hot tub.
2. Use a non-chlorine shock weekly
Shock the water weekly with a non-chlorine shock like FROG Maintain® to break down oils, lotions and soap residues. This keeps water clean without adding Cyanuric Acid.
Bonus tip: If you use dichlor as a sanitizer, you’re adding more Cyanuric Acid every time you add dichlor. Too much Cyanuric Acid causes hard-to-manage, itchy, harsh and even smelly water.
3. Clean your filter monthly
Clean the hot tub filter monthly using a suitable cleaner; follow the manufacturer’s instructions. Having an alternate filter helps maintain cleanliness, extends filter life and keeps you going if you find your filter worn, torn or damaged.
4. Always rinse off before hot tub use
Take a quick shower (no soap) before using the hot tub to rinse off lotions, perfumes, deodorants and sweat and stop them from entering your hot tub water.
5. Use a dedicated swimsuit
Choose a swimsuit for hot tub use that isn’t washed with detergent. Rinse it with plain water and let it dry between uses. If you use FROG products, which use much less chlorine or bromine, your swimsuits will stay brighter for much longer!
Hot Tub Problem #3: Green Water
What Causes Green Hot Tub Water?
If your hot tub water is green, algae isn’t always to blame. Oxidized copper, iron, manganese and even biofilm can also be the culprits. But it is still important to not rule out algae.
Algae: The Slimy Invader
Algae typically appears due to low sanitizer levels, poor filtration, inconsistent maintenance, and organic matter entering the tub. Signs of algae include:
- Slimy texture: Slick or slippery water and surfaces
- Cloudy water: Murky appearance with a green tint
- Musty odor: Unpleasant smell
- Improper pH balance: pH testing outside of the ideal range (7.2 – 7.6)
Oxidized Copper: The Sneak
If green water is clear with no slime or smell, oxidized minerals, most commonly copper, might be the cause. Sources include:
- Source water with high copper content
- Erosion of copper components
- Copper based algaecides
How to Fix Green Water in Your Hot Tub
Once you’ve identified the cause of the green water, you can correct it efficiently.
How to Treat Algae
1. Shock the water
Use a chlorine or non-chlorine shock treatment. Follow the product instructions for the correct dosage.
2. Brush and clean
Scrub the hot tub walls, floor and cover to remove all algae.
3. Filter maintenance
Clean or replace the filter cartridge to ensure proper filtration.
4. Regular maintenance
Maintain proper sanitizer levels, keep the filter clean , cover the hot tub when not in use and follow a routine cleaning schedule – including the inside and outside of the cover.
How to Treat Oxidized Copper
1. Add a metal sequestering agent
This will bind with copper to prevent discoloration. Your local retailer can recommend best products – they’ll be familiar with local water sources.
2. Drain and refill
If copper levels are high, partially drain and refill the hot tub with fresh water. Be sure to balance the water afterward, correcting and adjusting Total Alkalinity, pH and Total Hardness if needed.
3. Check source water
Test your source water for copper content before refilling. Use a hose filter if copper levels are high.
4. Maintenance routine
Regularly test and balance Total Alkalinity, pH and Total Hardness. Avoid using copper-based algaecides if your water has high copper levels. Balanced water is the key to clean, clear water!
How to Treat Biofilm
Drain, Clean, Rinse and Refill
If green water persists, biofilm might be the cause. Before draining, use a spa purge product – and a biofilm cleaner if needed. Then drain the tub, clean the filter, surfaces and pipes.
Thoroughly rinse the hot tub to remove all residue. Refill using a hose filter to avoid new contaminants. After the tub is filled, balance the water and add sanitizer.
Check out our in-depth guide for hot tub purging in our hot tub articles.
Prevent Green Hot Tub Water
1. Keep your hot tub covered
Covering your hot tub when not in use prevents debris from getting into your hot tub water. It also keeps the sun from promoting algae growth.
2. Test water regularly
Frequently test your water to maintain proper balance, including sanitizer levels, Total Alkalinity, pH and Total Hardness. This helps you prevent issues and catch problems early.
3. Use quality chemicals
The most inexpensive chemicals may seem like the best deal, but they’re often not. For example, some inexpensive chemicals may have lower concentrations, meaning you have to use more to get the results you want. They may also have a shorter shelf life.
Invest in high quality sanitizers, algaecides and metal sequestrants to keep your water clean and clear. Your local retailer will have recommendations.
4. Clean routinely
Regularly clean hot tub surfaces and filters to prevent algae and contaminant build-up. Stay on schedule with drains and refills to maintain water quality.
Hot Tub Problem #4: Excess Chlorine in Your Hot Tub
Signs of Too Much Chlorine in Your Hot Tub:
- Dry, itchy skin
- Eye irritation
- Strong chemical odor
- Faded swimsuits
- Faster corrosion of hot tub equipment
How to Reduce Chlorine Levels:
1. Regularly test and balance water
Test the water and adjust as needed to keep the water at ideal levels: Total Alkalinity (80 – 120 ppm), pH (7.2 – 7.6) and Total Hardness (150 – 250 ppm).
2. Dilute the chlorine
If chlorine exceeds 3.0 ppm, dilute it by partially draining and adding fresh water or completely draining and refilling the hot tub. And, you guessed it, test and balance the water after adding fresh water.
3. Consider Alternatives Sanitizers
Use mineral systems or other alternatives to reduce chlorine use and maintain more consistent levels. Consider FROG® @ease® Sanitizing System for your hot tub. It keeps chlorine levels consistent and allows you to use up to 75% less chlorine*
FROG @ease combines FROG Minerals with SmartChlor®, a unique patented form of chlorine. Together, they kill bacteria 2 ways and create Fresh Mineral Water®∞ that feels silky soft with far less odors.
Problem-Free Hot Tub Bliss
Enough about troubles – what about the top 4 hot tub well-being benefits – that’s why you got a hot tub, right?
We’d like to leave you with the 4 top benefits of hot tubs, so you can say “goodbye” to those 4 hot tub troubles you now know how to tackle, and “hello” to your own slice of paradise.
It’s time to get in your hot tub and enjoy:
- Improved sleep
- Stress management
- Pain management
- Cardiovascular health
Here’s to keeping your hot tub a crystal-clear oasis, ready for you to unwind and enjoy at any time.
*Compared to the minimum ANSI recommended chlorine level of 2.0 ppm for a hot tub or swim spa
∞ Cleaner, Clearer and Softer water for pools, hot tubs and swim spas
