FROG® @ease® In-Line System

The built-in Hot Tub Sanitizer with minerals and up to 75% Less Chlorine

Average Rating: 4 83 Reviews

Introducing a breakthrough in sanitizing that comes ready to use on your hot tub.  With the built in FROG @ease In-Line System, you simply open the cap on your hot tub, snap in the conveniently adjustable cartridges and enjoy weeks of cleaner, clearer and softer water. FROG @ease uses FROG Minerals and SmartChlor® Technology that creates Fresh Mineral Water® by killing bacteria two ways with up to 75% less chlorine and a lot less work!

Pool Foreground Hot Tub Foreground
@ease 75 Percent Less

Up to 75%* less chlorine with no frustrating yo-yo chlorine levels

Shock Once

Shock only once a month

Self Regulates

Self regulates for continuous crystal clear water

@ease Easy On

Easy on hot tub surfaces with less odors

@ease Color Match

Single color match for easy reading – exclusively with FROG @ease Test Strips

No Constant Monitoring

No constant monitoring

@ease No Mixing

No mixing chemicals

Money Back Guarantee

Money back guarantee


Another FROG @ease benefit – no cyanuric acid that can lead to problems.

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Video Introduction to FROG @ease Inline System


Additional Information

The @ease System combines the proven FROG mineral formula for killing bacteria with SmartChlor Technology that maintains a consistently low chlorine level for weeks.

Unlike normal chlorine that is used up when you get in, SmartChlor continues to maintain the same level which is up to 75% less than hot tubs using Dichlor (standard hot tub chlorine). That’s why we call it self-regulating.  It goes to work when the hot tub needs sanitizing so there are no frustrating yo-yo chlorine levels.  This time-released method is also why less shock is needed to maintain the hot tub. When the SmartChlor Cartridge is depleted the system will flip over as a visual reminder to replace the empty cartridge with a new one.

This technology is so unique it has its own testing method that’s easier than standard test strips.

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In 2 seconds, you can know precisely whether your pH, Total Alkalinity and Hardness are balanced, plus whether or not SmartChlor® needs replacing. Simply dip the FROG @ease Test Strip into the water, remove with the pads facing up and shake once to remove the water on the FROG Test Strips. Then hold it up next to the color chart on the back of the bottle to compare colors.

If the SmartChlor color on the strip is darker than the bottle label, the water is fine. If it is lighter it’s time to replace the Smartchlor Cartridge.

This technology is so unique it has its own testing method that’s easier than standard test strips.

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A new standard for keeping your Hot Tub water crystal clear- continuously.

Less Chlorine

Up to 75%* less chlorine with no frustrating yo-yo chlorine levels.

Less Shocking

Only shock once a month!

Self Regulates

Self-regulates for continuous crystal clear water.

Less Odors

Easy on hot tub surfaces with less odors.

  • Unique form of chlorine that works only with FROG minerals
  • It’s EPA registered
  • Unlike dichlor it’s slow dissolving
  • It’s self-regulating by automatically delivering more free chlorine when needed
  • It maintains a consistent 0.5 – 1.0 ppm free chlorine level at all times

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What size hot tub will FROG @ease work in?

Hot tubs 150 to 600 are perfect for FROG @ease.

How does FROG @ease compare to bromine floaters or using chlorine?

With standard chemicals you experience peaks and valleys in your sanitizing routine.  When you add chemical, the level spikes, when you use the tub, the level drops. This yo-yo method goes away with FROG @ease because it maintains the same level of sanitizing all the time.  Plus it’s conveniently tucked away with easy access whenever you need to change a cartridge.

How can it work so well with 75% less chlorine?

SmartChlor is not a typical chlorine.  It will consistently maintain a 0.5 to 1.0 ppm free chlorine level. This would not be enough on its own; but with FROG minerals, it’s a perfect combination that kills bacteria 2 ways so you have a cleaner, clearer hot tub that’s wonderfully soft and odor free!

How long do the Mineral and SmartChlor cartridges last?

The mineral cartridge lasts four months or whenever the hot tub is drained and refilled. The SmartChlor Cartridge lasts 3-4 weeks depending on the size of your tub and how often it is used.

Is a FROG @ease System expensive?

SmartChlor is slightly more expensive than dichlor but less than other systems. Consumers who have tried it tell us it is SO worth the money because it makes owning a hot tub extremely easy with far less monitoring and no shocking for an entire month. You save time and the cost of shock treatments plus with up to 75% less chlorine, your suits won’t fade and your hot tub itself has less wear and tear.

Which hot tubs have the FROG @ease In-Line System built-in?

Marquis Spas, Caldera Spas, Artesian Spas and Hot Springs Spas all have the in-line system installed on select hot tub models at their factory.

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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. Dale Slack

    Terrible product. Spa water got cloudy in a month. Won’t ever use it again.

    • Kris Gruidl

      Hey Dale, thanks for your review. We’re sorry to hear you got cloudy spa water in a month. We’d like to earn back your business. If you would call Dan at 800-222-0169 or email him at dan.mosier@kingtechnology and give him a few minutes, he will walk through some steps to ensure cloudy water isn’t an issue.

  2. Mike

    Rating: 3

    Love the frog cartridges for our spa, but they need to develop a reusable version. The world is full of too much plastic waste

    • Kris Gruidl

      Hi Mike, thanks for posting. We hear you and we have a team working on sustainability. The original intent was to make water care easier, so no one has to measure out chemicals. Since they are chemicals, they need to be contained in childproof containers and only certain plastics will work. With that said, we are looking at how we can recycle or reuse the empty cartridges. Please stay tuned. If you’re interested in learning more, feel free to call us at 800-222-0169 or email us at We love to hear what matters to you and we’re always open to ideas.

  3. Brian

    I use to use your product but I just can’t justify how expensive it is. And it only lasts closer to 2 weeks then 4. Even with routine shocking. Still way to expensive

    • Kris Gruidl

      Hi Brian, Thanks for the review. We appreciate everyone’s point of view – The FROG @ease SmartChlor works on hot tubs up to 600 gallons. The statement of 3-4 weeks was based on the most popular hot tub – 400 gallons – thats used twice a week by 2 people. You don’t have to handle or measure chemicals or guess. We’d love to help you get the most out of your SmartChlor cartridge, please give us a call or an email. We’re at 800-222-0169 or

  4. Wendy Harris

    Rating: 5

    Makes keeping the spa sanitary easy but have to weigh the cost versus manual chemicals.

  5. John Berti

    Rating: 1

    I’ve had this system in my Caldera Spa Marino for two years, and the cartridge holder is falling apart and cracking. Not well made, it seems!

  6. Jourdan

    Rating: 1

    My Smartchlor canister lasted only 1 week! This amount of plastic waste that this will create is completely unacceptable.

    • Tom Sager

      Hi Jourdan,
      There could be several reasons why the SmartChlor canister only lasted a week. The two big reasons why the SmartChlor isn’t lasting long are if the water isn’t balanced (pH and TA) and if the SmartChlor cartridge is on top in the holder. When the pH, Total Alkalinity, and hardness are not balanced it can negatively affect the SmartChlor’s effectiveness and the stability of the water. So, getting those in the proper ranges is the most important step, the next step is to see if the SmartChlor cartridge is on top in the cartridge holder. When this happens it can cause over the cartridge to not last the full 3-4 weeks.

      Regarding the plastic waste, we have received other feedback regarding this matter and have been trying to develop a system for refillable containers. The mineral cartridge can be recycled after the SmartChlor has been used up in your spa because it’s just residual limestone granules. Unfortunately, the SmartChlor is considered haz-mat, so it does not make it easy to dispose of in a green way.

      We would love to help troubleshoot the SmartChlor issue with you further, please email the customer service department at or call them at 800-222-0169.


  7. bill smith

    Rating: 4

    I agree with the MANY others on here. I havent had my tub long so I dont have a hard opinion on the system yet, (so far so good) but hate that there is not a refillable options. The waste is terrible!

  8. Carol Wisman

    Rating: 5

    Nothing but Happy! We’ve had our spa about a year now. Everything was going great. “Suddenly” I started “burning through” the Smartchlor cartridges. Now not happy, tried to troubleshoot on my own. (My 1 st mistake) Thought the cartridges were “light on chlorine”. Grumbled many times to myself. Thought I was suddenly doing something wrong. I finally reach out to Dan. (2nd mistake of not just calling him 1 st!)He spent about an hour with me on the phone. Turns out all I needed was to do a ” pipe purge”. Easy fix. I’m sure my dealer told me about this particular maintenance thing, but being new to spa ownership, I forgot about this important step. Can’t say enough good things about the effort Dan showed in helping me.

  9. Bob

    I purchased a three pack of the chlorine cartridges and found that they were very light on chlorine granules. I weighed each canister…one was 200 grams, one was 220 grams and the third was 254 grams? And, they only lasted 1 week without even using the tub?! What’s the deal? The one that came with my tub lasted at least 3 weeks and was heavy and full.

    • Tom Sager

      Hi Bob-

      Thank you for reaching out. Product inconsistencies are concerning and we would like to get to the bottom of it with you. Could you please contact Dan, our customer service lead, at or even better, call him at 800-222-1069. He will be happy to gather additional details and investigate this further.

  10. Sallie

    Please address the plastic waste issue commented on by almost every review on this site!
    Please offer reusable cartridges & bulk minerals for online purchase right away. TIA.

    • Wayni Tao

      Hello Sallie, thank you for your review. We have a team of engineers working on environmentally friendly options for the future that will continue to protect people from chemicals. Because all our products are EPA-regulated, we are required to follow very strict guidelines. We’d truly like the opportunity to talk with you about our products’ ability to effectively sanitize your hot tub – including how you can use less chlorine. Please email Dan Mosier at He heads up customer service and he’d really like to help you get the most from your FROG @ease system.

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