FROG® Serene® Floating System

Complete Hot Tub Sanitizing Floater creates Fresh Mineral Water

Average Rating: 4 45 Reviews

FROG Serene keeps your hot tub clean while eliminating the work and the guesswork. Instead of spooning in chlorine daily, you simply replace a pre-filled cartridge about once a month. FROG Serene works by killing bacteria in two ways with sanitizing minerals and a very low level of bromine. The resulting Fresh Mineral Water® has a completely different quality that provides the serene feeling you’re looking for.

Pool Foreground Hot Tub Foreground
50% Less

Lower your bromine use up to 50%* with FROG minerals

Bromine Disolves

Unlike chlorine, bromine slowly dissolves in hot water so it’s easier to regulate. Plus far less odors.

Self Regulates

Bromine is less impacted by pH swings ensuring sanitizing effectiveness

Soft Feeling

Soft feeling water that’s easier on skin, swimsuits and spa surfaces

Set and Forget

Just set it and forget it for weeks at a time

Money Back Guarantee

Money back guarantee

FROG Serene Family of Products

Video Introduction to FROG Serene Floating System


Additional Information

The FROG Serene Floating System Fresh Mineral Water hot tub system utilizes mineral and bromine cartridges designed to destroy bacteria, reduce bromine use by up to 50% and improve the overall quality of hot tub water. The minerals last up to four full months, while the bromine can be dialed in to meet your precise needs, usually about three weeks per cartridge. Just snap the two cartridges into the floating cap and relax!

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What size hot tub will FROG Serene work in?
Hot tubs 150 to 600 are perfect for FROG Serene.

How does FROG Serene compare to other bromine floaters or using chlorine?
If you are tired of smelly chlorine odors and having to spoon in chemicals every time you use your hot tub, SPA FROG is for you. FROG Serene is not just bromine. It contains FROG minerals that destroy bacteria so you need up to 50% less bromine. The result is soft water without bleached suits or smelly odors.

How long do the mineral and bromine cartridges last?
The mineral cartridge lasts four months or whenever the hot tub is drained and refilled. The bromine cartridge lasts 2-4 weeks.

Can I remove SPA FROG from the spa when in use?
Yes. Simply turn it upside down on any surface so the water fills the green holder and doesn’t make a mess. Just remember to replace it when you exit the tub.

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* Compared to the minimum ANSI recommended bromine or chlorine level of 2.0 ppm for a hot tub

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See Our Customer Reviews

  1. Edward Kintzinger

    just bought my hot tub first week last November, I’ve been using the Frog floating system because that’s what was sold with it. I’ve had CONSTANT problems; just can’t get levels to sustain enough to take a reading. Take last Sunday, for example. Decided to just change out the water and start over. Drained & filled; put a brand new yellow Frog cartridge in set on 4, and let it set overnight. Next afternoon, the test strip said alkalinity 180 or more & bromine 0; so I added 2oz chlorinating granules and 2oz pH down and tested again in an hour. It tested alkalinity 120, and bromine was way over 20. Tested again in 3 hours and bromine was down to 10. Left it set overnight. Next afternoon, on Tuesday, it tested alkalinity 180, & bromine 10-20; added 2oz pH down and turned yellow cartridge down to 3. Around midnight, I used the tub for about 1.5 hours. Next afternoon, on Wednesday, it tested alkalinity 120 & bromine 0. The place that sold me the spa has been working with me this last water change. He told me he’d never heard of this happening before, and would get back to me after some research; haven’t heard back yet, I’m attempting my own research. I’ve thrown the algae theory out because there’s no slime in the tub. I’ve heard of chlorine turning bromides to bromines; and I’m wondering if leaving the Frog floater in the spa when I shock the tub can damage the bromine? I shower before I get in the spa. Please help, my local retailer seems baffled, and I’m certainly clueless…

    • Sarah Miller

      Hello Edward,

      Very sorry you having tough times with your Hot Tub. We would be very happy to help you solve the issues you are having. I want to make sure you get the best results so if you could email us at customer service we will get back to you asap. Please include your phone number so we could call you. Email Dan Mosier at and he will contact you quickly.

      Thank you,


  2. Newby

    Rating: 5

    first time hot tub owner just went through the cleaning process and now added your cleaning system and shocked it and then put the floating system in how long do I have to wait before me and my wife can use it for the first time? Thanks for your help

    • Sarah Meyer

      Hi Newby,

      24 hours after adding Jump Start to the spa you can use it.



  3. Carl

    Rating: 5

    I love the product. Switched to it from a chlorine base system. So much easier. Question – We also have a swim spa with a capacity of 1500 gal. We are currently on a chlorine system. Can you recommend a bromine system for that capacity. My hot tub is doing so great I am hoping for my swim spa to do the same. Thanks

    • Sarah Miller

      Hello Carl,

      Unfortunately, we do not have a product designed for spas that are greater than 600 gallons.


  4. Karen

    I am having trouble with my water quality-I am using the spa frog system, but the ph tends to run low as does the chlorine and free chlorine levels. Does anyone have any ideas for me on what to do?

    • Sarah Miller

      Thanks for your comments.

      Your bromine levels should be between 1-2ppm. If below, turn your cartridge up 1 setting. Your PH levels should be between 7.2-7.8. If they’re low your Alkalinity is likely low. Since Alkalinity is a measure of your waters ability to control PH begin by increasing your Alkalinity to between 80-180ppm. Your PH will rise as you increase Alkalinity and may fall into the correct range.


      Customer Service King Technology

      • Kirk

        How do you raise alkalinity?

  5. meditub schwartz joe

    I am truly grateful to the holder of this website who has shared this enormous piece of writing at at this time.

  6. TEMOLIN Pawley

    I’m using this product. I have a lot of bubbles in my hot tub is that normal

    • Sarah Miller


      The bubbles are not coming from the Spa FROG Floating System. If you have a lot of bubbles or foaming it’s coming from body oils in the water that react to the natural alkalinity and aeration in the spa causing foaming.

      The best way to take care of foaming is to prevent it by reducing body oils in spa, avoiding headrest cleaners contact with water, and maintaining a low calcium level of around 150ppm.

      Hope that helps,


  7. Ken Krogue

    Rating: 5

    This is what makes having a spa worth it. I love things that are easy and simple and help take care of themselves. What a breakthrough! Putting in chemicals by hand every few days isn’t worth having a spa after a while.

  8. Sandra Ostheimer

    LOVE THIS PRODUCT!!! My husband and I were new hot tub owners and having issues with keeping the PH right in our unit. Friends of ours gave us the start up kit of SPA FROG and we are never looking back. Easy and works perfectly. Recommend this product to everyone!!!!!

  9. Bruce Clayton

    Rating: 2

    I have an inline system on a hot tub. I can never get the levels correct using.the system alone. I always resort to.using.other products

  10. Sallie Mollohan

    Rating: 5

    I switch to Frog System 6 months ago for my hot tub, The results are amazing! My chemicals are always balanced and the water is always crystal clear, No heavy bromine odor and it is so easy to do. No more fuss with measuring chemicals and constantly testing,

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