It's not easy being green
Your hot tub water turning green signals algae overgrowth, which thrives in warm, still water with a pH above 7.2 and low sanitizer levels.
Expect to pay $240 to $900 annually for hot tub maintenance, and addressing algae or mineral issues early helps you avoid higher repair costs.
Shocking your spa with chlorine or bromine kills algae quickly, and running the hot tub regularly keeps water circulating to prevent future growth.
Hiring a local hot tub repair professional provides clear guidance on shock treatments and mineral issues, helping you restore your water's clarity confidently.
After a long, hard day, you're looking forward to soaking in your hot tub. The only problem is that when you lift the lid, you're greeted by a shock of green—not exactly what you want to see when all you want to do is relax. If you're wondering "why is my hot tub green," it's usually due to either too much algae or too many minerals. Here's how to deal with it.
You and your family aren't the only ones who enjoy the warm water of your hot tub. According to the U.S. Department of Energy, algae—a group of organisms that can be part of the bacteria, chromista, plant, or protista kingdoms—love warm water.
The microorganisms also tend to thrive in still water with a pH over 7.2. So if it's been a minute since you last soaked in or sanitized your hot tub, you may find that algae have taken over.
If algae are turning your hot tub green, you need to give it a shock by killing the hot tub bacteria and restoring the pH of the hot tub water. Shocking your hot tub increases the chlorine or bromine level in the tub, killing off the algae. Follow the instructions on the shock treatment to ensure you do it correctly. After shocking the tub, remove and clean the filters to get rid of any traces of algae.
Depending on how much algae you're dealing with, a shock treatment may be sufficient to restore the water's blue color. But, when the tub is completely overrun by algae, they may stick around even after treatment. In that case, you'll want to drain the tub and clean the hot tub interior, using a non-abrasive household cleaner or a product specially made for cleaning hot tubs.
Refill the tub, and add the appropriate treatment to maintain adequate chlorine or bromine levels. Test the water after 24 hours to make sure the pH and chemical levels remain in range.
To keep the algae under control, keep up a regular schedule of shocking the tub and also running it, so that you get the water churning.
Certain types of minerals, notably copper and iron, can give your hot tub water a greenish tinge. Metal or mineral content may be to blame if you're keeping up with hot tub maintenance and maintaining appropriate treatment levels but still seeing green water.
You can easily tell if the tub is green due to algae or minerals by touching the water or sides of the tub. Algae typically makes the water or tub sides feel slimy to the touch.
To get the green out, you'll need to do something about the mineral content. One option is to change the source of your hot tub water, which may be particularly useful if you're filling the tub with well water.
The other option is to treat the water to neutralize the minerals. Consider installing a pre-filter to trap heavy metals and keep your water clear.
If you're not sure whether algae or minerals are to blame for your hot tub's green color or you're not comfortable giving your tub a shock treatment on your own, it's worthwhile to hire a local hot tub repair pro to diagnose the problem and treat it.
When hiring someone to fix your hot tub, it's usually best to find a technician who works with your specific brand. Your best bet may be to contact the dealer that sold you the hot tub and ask about repairs. To help keep the green from returning, you may also want to find out if the dealer offers maintenance plans.
A little bit of maintenance can go a long way toward keeping your hot tub clean and clear:
Test the water's pH and chemical balance at least twice a week.
Sanitize or shock the hot tub once a week.
Run the hot tub frequently to keep the water moving.
Inspect the tub's filters every other week.
Clean the tub's filters once a month.
I had FabClean 614 clean my apartment, and she did an outstanding job. She was so professional and efficient. My apartment looks absolutely spotless every surface, every corner, all cleaned to perfection. Definitely highly recommend FabClean 614 if you're looking for top-notch cleaning...
Fab Clean 614Binion and Alex did such a good job. Fast, fair, efficient. Would def use them again. Best experience Iâ ve had in moving - someone should give them a raise. Will undoubtedly recommend this service.
All My Sons Moving & StorageGreat customer service. The owner Ilia was wonderful to work with. Would definitely recommend this company.
Window Depot USA of Central OhioI definitely recommend Ramonaâ s cleaning service! I have booked services with her many times and she arrives on time, ready to work and provides a great service.
Your Cleaning Solutions LLCExcellent experience! Left my place looking great. Friendly customer service too. Would recommend!
The service was excellent! They gave me a quote, and had it done 4 days later. My driveway looks amazing, very professional! I would definitely recommend their service to anyone. I have had neighbors stop by and ask for their information as well.
All Star Paving and SealingWebb â s was priced well, flexible on scheduling, great with communication, and detailed in their work. Iâ ll definitely use their services again.
Webbs Pressure and Paint LLCThey’ve been great to work with. All of my clients that have used them have nothing but good things to say about the experience. Quick responses and fast service. They’re a trustworthy team!
Total Home RoofingMary Cleaning Service is amazing! The entire staff is very professional and they pay a great deal of attention to detail. I would definitely recommend!
Their service is very prompt and the rates arevery fair.
NutriLawnFrom average costs to expert advice, get all the answers you need to get your job done.
Hot tub costs vary, depending on the type of spa you choose. Learn how much hot tubs cost in 2026 and how to save on new hot tub prices.
We could all use some relaxation, but we don’t always have the budget. This guide will show you how much an in-ground hot tub costs—no matter the build.
Biofilm in hot tubs is an issue you should take care of right away. Here is everything you need to know about biofilm and how to get rid of it.
It’s difficult to narrow down the best hot tub sizes for your space. This guide can help, whether you’re putting it on a small patio or in a large yard.
Have you wondered how to maintain a hot tub without chemicals? Find out if you really need to use all of the different chemicals you see on store shelves.
Installing an indoor hot tub is a great way to bring the spa experience inside. Learn how to avoid indoor hot tub problems like moisture, mold, and drainage issues. From flooring to water supply, these crucial tips will ensure a smooth installation.
