7 Best Hot Tub Sanitizers 2021 – Reviews & Top Picks

Last Updated: June 18, 2021

Owning a sizzling tub could be an pleasing expertise. It’s nice to have the choice to take a seat in it and calm down after a protracted day at work. However, should you don’t preserve your sizzling tub, it’ll construct up mildew, algae, and micro organism that may trigger hurt to you and others.

To provide help to along with your upkeep wants, we’ve gathered a evaluation listing of the highest seven sizzling tub sanitizers with totally different options, so you could find one that’s preferrred for you. The purchaser’s information gives you extra details about issues to think about earlier than you make your buy.

A Quick Comparison of Our Favorites

The 7 Best Hot Tub Sanitizers – Reviews 2021

1. Zodiac W20750 SPA Stick Mineral Sanitizer — Best Overall

Zodiac W20750 Nature2 SPA


Nature2 gives a substitute for chlorine that’s low upkeep but efficient. It makes use of pure minerals to sanitize the water by destroying the micro organism that cross by your sizzling tub’s filter. You know this sanitizer is working once you see how clear the water is.

It is assured to not stain surfaces, and it’s put in in seconds by dropping it into the spa filter. It continues to work even when the new isn’t working and helps preserve pH ranges impartial, which prolongs the lifetime of your gear. We like that it’s higher for the pores and skin as a result of there are fewer harsh chemical substances within the water.

On the draw back, you’ll nonetheless want to make use of 0.5 ppm of chlorine, however this can be a small quantity that you just received’t scent or really feel. On the upside, one filter can last as long as 4 months, so that is an reasonably priced various to different costly cartridges available on the market.


  • Natural minerals
  • Destroys micro organism
  • Doesn’t stain
  • Easy to make use of
  • Neutralizes pH
  • Less harsh
  • Lasts as much as 4 months


  • Still have to make use of chlorine

2. CLOROX Pool&Spa 23014CSP All-in-One Sanitizer — Best Value

CLOROX Pool&Spa 23014CSP


CLOROX Spa is one of the best sizzling tub sanitizer for the cash as a result of it stabilizes the water and is obtainable at an reasonably priced worth. It is formulated for spas and sizzling tubs and works by killing micro organism and destroying contaminants.

Also, it’s a chlorinate and shock in a single bundle, which suggests it breaks down the natural waste that causes the water to turn into cloudy and odorous. You will discover how clear your water turns into after utilizing this. You will scent chlorine, however any dangerous odors will probably be gone. It removes physique oils, sweat, lotions, and urine, so your water is absolutely sanitized from contaminants.

It is simple to make use of by making use of the really helpful quantity as soon as per week, however you must wait till the chlorine ranges attain 3-5ppm earlier than you employ the new tub once more, which is why this didn’t attain the quantity-one spot on our listing. However, one bottle will final for roughly 4 months.

3. POLYTRANS Hot Tub Spa Mineral Sanitizer Sticks — Premium Choice

POLYTRANS Hot Tub Spa Mineral Sanitizer


This sanitizer stick by POLYTRANS is a mineral sanitizer that’s simple to make use of however is a pricier product, which is why we positioned it quantity three on our evaluations listing. The bundle accommodates two sanitizers, and each will last as long as 4 months. To use, all you must do is drop it into your filter and overlook about it. Unfortunately, this filter is not going to work in each sizzling tub as a result of the required filter size is at the least 7 inches, with a filter gap diameter of at the least 1.25 inches.

There aren’t any harsh chemical substances on this product, and it successfully kills micro organism, viruses, protozoa, and fungi which are current in your sizzling tub. Your water will probably be crystal clear and odor free, so you may take pleasure in your time within the water with out worrying about what could also be current. You will discover a distinction in how your pores and skin feels, and it received’t discolor your garments or sizzling tub gear. It will even cleanse when the bathtub isn’t working.


  • Easy to make use of
  • Lasts as much as 4 months
  • No harsh chemical substances
  • Kills quite a lot of dangerous pollution
  • Gentle on pores and skin
  • Won’t discolor
  • Also cleanses when not working


  • Pricey
  • Won’t match each sizzling tub

4. Sundance 6890-780 SunPurity Tub Mineral Sanitizer

Hot Tub Mineral Sanitizer SpaPurity


This sanitizer cartridge is made for Sundance Spas as a pure mineral purification that disinfects and supplied algae prevention and clarification. After utilizing this, the water turns into cleaner, softer, and clearer.

Not solely does it sanitize, nevertheless it additionally removes odors and any residue strains alongside the waterline of the new tub. It can be utilized with the new tub ozone system. You do have so as to add a small dose of a non-chlorine oxidizer to obtain full sanitization. It is a superb various to utilizing harsh chemical substances, and the lifespan is roughly 4 months.

Unfortunately, you can not use this technique with different manufacturers of sizzling tubs, and it’s a dear sanitizer despite the fact that it really works properly for the Sundance techniques.


  • Natural minerals
  • Disinfects
  • Algae prevention
  • Make water clear
  • Removes odors and residue
  • Four-month lifespan


  • Pricey
  • Only for Sundance techniques

5. iONRx Natural Hot Tub Sanitizing Treatment

iONRx Natural Hot Tub Sanitizing Treatment


The iONRx is a pure sizzling tub sanitizer that makes use of a small quantity of chlorine to deal with the water. It is simple to make use of, although you must add some every week for it to be efficient. For 100 gallons, you add 4 ounces on to the water, and at that charge, it’ll final for 10 weeks when you’ve got a 300-gallon sizzling tub. Thus, this product can turn into dear when you’ve got a big tub to deal with. Keep in thoughts that you’ll want so as to add a small quantity of oxidizer, comparable to faucet water, that accommodates small ranges of chlorine.

However, there aren’t any chemical odors, it’s non-corrosive, and it eliminates the necessity for shock, bromine, and different enzymes. We like that it’s protected to make use of on all sizzling tubs and has been formulated for individuals who need a chemical-free answer that has been used commercially for over a decade.

6. SPA TIME 17487STM Dual-Purpose Sanitizer



The SPA TIME is a twin-objective product that features each sanitizer and shock. It is a chlorine-primarily based product that you just add on to your sizzling tub. The course of is a bit more in-depth than different sanitizers, so that you wish to ensure you comply with the instructions fastidiously.

This product does a very good job of lowering the expansion of micro organism, stopping and eradicating algae, and producing clear water so you may take pleasure in your time soaking within the tub. It is a pleasant characteristic to have the sanitizer and shock two-in-one to save lots of you time. You will wish to check the water earlier than use to verify the chlorine ranges aren’t too excessive. You might want to carry out the therapy course of weekly. How lengthy the bottle lasts will probably be depending on the dimensions of your sizzling tub. Overall, it’s an reasonably priced choice to sanitize smaller sizzling tubs.


  • Sanitizer and shock
  • Reduces micro organism
  • Prevents algae development
  • Makes water clear
  • Affordable for small tubs


  • Lengthy therapy course of
  • Test water earlier than use

7. Jacuzzi 2890-185 ProfessionalClear Mineral Spa Sanitizer



The Jacuzzi ProClear mineral filter works to sanitize your sizzling tub. You place it in your present filtration system, and it’s appropriate with all sizzling tubs as much as 500 gallons. One cartridge will final about 4 months, so it’s a considerably dear however problem-free various for sanitizing the water.

It leaves the water clearer and softer as a result of it’s chemical free, and the cartridge is designed to slowly launch the minerals over the 4 months to repeatedly clear and preserve the water pH balanced. We discovered that the ProfessionalClear works one of the best when used with clear water as extra of a preventative to maintain the water clear and freed from micro organism.


  • Mineral filter
  • Easy to make use of
  • Last for 4 months
  • Clear and gentle water
  • Balances water pH


  • Pricey
  • Ideal for clear water

Buyer’s Guide

When on the lookout for a sanitizer, there are issues to think about to search out the one which works properly for you and the kind of sizzling tub you personal. This part gives concepts to remember as you slender down your search. Making an knowledgeable determination will provide help to obtain one of the best final result and save you time and cash.


Types of Sanitizers

Chlorine: This is the most well-liked alternative for a sanitizer as a result of it has been used for a few years, so everybody is aware of and trusts that it really works. It is a broadly out there and price-efficient possibility. If you employ chlorine in your sizzling tub, you shouldn’t be capable of scent the chemical. If you do, the water in your sizzling tub will not be balanced appropriately.

Bromine: This is a transparent, odorless chemical that works the identical as chlorine. It is much more efficient at killing algae and might tolerate pH fluctuations higher than chlorine. However, you don’t wish to use this in case your sizzling tub is in direct daylight as a result of it makes the bromine ineffective.

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Minerals: These are another for sanitizing your sizzling tub as a result of they’re a pure technique to kill the micro organism in your water. Some would require a small quantity of chlorine or shock to totally sanitize your water, and lots of aren’t appropriate with bromine. You will see the minerals provided in cartridges that you just place in your filtration system. They will not be meant to filter however to scrub, so you continue to want a filtration system in place.

POLYTRANS Hot Tub Spa Mineral Sanitizer Sticks


Since you’ll be spending a good sum of money on a sanitizer, you will have one thing that’s efficient but lasts longer than a couple of days. Most sizzling tubs would require weekly testing to verify for water steadiness, and relying on the sanitizer you’re utilizing, you’ll have so as to add extra at the moment. Make certain the sanitizer you select is protected to make use of with different chemical substances which are in your tub.

Ease of Use

It takes time to take care of a sizzling tub, and creating a routine is crucial to conserving it wholesome and protected. The pH steadiness is a crucial issue, but when you must check it regularly, this takes time. Finding a sanitizer is a bonus so long as it does as supposed. It might take time once you first strive a brand new sanitizer, however you may develop a system so you know the way typically you must check and alter out the water.

Each sanitizer will come in several varieties. They could also be liquid, powder, tablets, or as a cartridge. It is all a matter of private desire and sort of sizzling tub you could have that may decide which one is one of the best for you. If utilizing a cartridge, be sure it matches inside your filtration system and is appropriate along with your sizzling tub.


As talked about, sizzling tubs are costly to take care of, so discovering one of the best sanitizer will ease a number of the worries and frustrations of caring on your sizzling tub. When narrowing down a selected model, ensure you know the way lengthy it’ll final. Hot tubs come in several sizes — the larger the new tub, the extra sanitizer that will probably be required.


A superb sanitizer will create a safe and clean hot tub that’s free from odors, micro organism, and different contaminants that may trigger reactions or allergy symptoms. Sanitizers are a obligatory merchandise, so you will need to discover the best one which does an efficient job. This evaluations listing highlights seven of one of the best.

Our high decide is the Zodiac Nature2 filter, which is an efficient system that’s easy to make use of and a terrific various to conventional sanitizing techniques. For a value-efficient various, the Clorox Spa gives a straightforward sanitizing answer that destroys contaminants with weekly functions. If the value isn’t a priority, the POLYTRANS mineral sanitizer sticks are a terrific possibility as a result of they sanitize with out chlorine and bromide and are simple to make use of.

We hope that our evaluations provide help to discover a sanitizer that’s inside your price range and straightforward to make use of so you may take pleasure in your sizzling tub to the fullest.

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