What makes Nature² the #1 natural alternative to chlorine (and bromine)?

Spa Purifier Nature2, with it's breakthrough technology, uses a uniquely patented mineral process that kills bacteria on contact,  faster than chlorine. And being powered by water flow, there's no electricity and no moving parts. It reduces the chemical consumption and the time you spend caring for your spa. Nature² water is brilliantly clear, soft and safe. Water purity you can see and feel !

Nature2 is a water purification technology for spas and hot tubs that gives the purest, clearest water imaginable. Nature² products use the same minerals found in nature to trap bacteria and algae. Because Nature2 traps bacteria and algae, less harsh chemicals are needed to keep your spa water balanced.

By using Nature², you reduce the level of harsh chemicals between 50% and 80% versus the harsh chemical levels you would need without Nature2.
It feels better.
  • Cuts chlorine & chemical use 50-80%
  • No more stinging eyes, dry skin and damaged hair
  • No more harsh chemical odors
  • Stops bleached and damaged bathing suits and towels
  • Stable water, even in hot weather and heavily used spas
  • Reduces chemical damage to pump and filter system
  • Compatible with other maintenance products

Nature² Advantages

  • Lasts four months
  • Makes spas easy to manage, halogen-free
  • Improves performance of ozone-equipped spas
  • Assures an odor-free spa
  • Significantly improves look & feel of water
  • Simplifies water balance and  it's unaffected by heat
  • 9 out of 10 spa users prefer Nature2 over their old method
It works better.
  • Patented mineral process traps bacteria
  • Saves time & money
  • No electicity, no moving parts.
  • It's powered by water flow
  • Reduces work & chemical volume
  • Installs in minutes into most cartridge filters.

What Nature² does.

  • Less chlorine, less chemical use, fewer chemical hassles.
  • No red, burning eyes, irritated skin or discolored hair.
  • Less time necessary for pool maintenance.
  • Nature2 will never create pool stains.
  • Easy to use.
  • Annual cost equal to or less than your current treatment.
  • A more refreshing, highly enjoyable swimming experience.

Nature² the Natural Spa Purifier for Cartridge Filters. Easy and Convenient!

Please see the Water Purifiers & Conditioners section of the Virtual Store for pricing and on-line ordering.

Our Customers say it best!

I just want a pleasant safe experience in the tub and with Nature2 it just so happens to be simple too! Thanks Nature² for your product!

Susan Blakey


Q: How do I know if Nature2 is working?
A: The best test is improved water quality. You'll notice a big difference. Visual clarity and sparkle, even at low oxidizer levels show Nature² is working properly.
Q: After it's installed, will water maintenance change?
A: Yes, you will dramatically reduce chemicals use and maintenance time. Water balance will be easier, meaning there's simply less to do.
Q: Do I still need to use chlorine? Why?
A: Yes, you need to use a small amount of residual oxidizer. With Nature2 you can reduce this amount by 50% to 80%. For superior results, we recommend low levels of free chlorine (0.5 ppm free chlorine minimum). You won't feel, smell or be affected by chlorine at this level.
Q: Are low levels of minerals safer in a spa?
A: Yes, water treated by Nature² actually meets and exceeds EPA drinking water standards for bacteria, silver and copper. Is Nature2 compatible with other products? Nature² can be used with every type of chemical treatment program available except bromine and bromide based chemicals, biguanide products (Baquacil* or SoftSwim**) and copper-based algaecides.
Q: Is Nature2 a filter?
A: No. A filter removes particles and debris, while Nature² purifies water by trapping bacteria and algae, which are too small to be caught by a filter. You still need a filter when using a Nature2 system.
Q: Is Nature² an "ionizer"?
A: No. Ionizers electrically discharge copper (or metal alloy) ions into water. Ionizers can deliver ions via an electrical current (electrodes) or salt dissolution. When do I replace the cartridge? Each model comes with a reminder to tell you when to replace it.
Q: What affects cartridge life?
A: Nothing — including filter run time, heavy use, hot weather, and water temperature.
Q: How do I dispose of used cartridges?
A: The minerals inside Nature2 are natural, so it is safe for disposal with other household trash.
Q: How often do I need to super-oxidize (shock)?
A: Because of the efficiency of Nature², super-oxidation is needed much less often. You only need to super-oxidize if the water becomes dull or cloudy. The start-up of each new cartridge requires an initial shock with chlorine.

Nature2 Owner's Manual
(or download a PDF manual HERE)

Important Safety Information

Please read this manual prior to installation.

The Nature2 Spa is for use in residential portable spas only.
Nature2 Spa is designed to sanitize spas up to 500 gallons.

ATTENTION Failure to heed the following can result in permanent injury or drowning. !


  • Always turn spa off prior to installing or changing Nature2 Spa. Your spa system is operated under pressure and the pressure must be released before you begin work. Please see your spa owner's manual for further instructions.


  • Do not let anyone, especially small children, sit, step, lean or climb on any equipment installed as part of your spa's operational system.


  • You must strictly follow the Nature2 Spa recipe included in this manual to maintain proper water chemistry and avoid health hazards. Failure to follow these instructions can lead to sickness from bacteria and other noxious organisms.

CAUTION: In the unlikely event that a cartridge breaks, mineral media should not be ingested by humans or animals as it may cause gastric distress.

FIRST AID IF INGESTED: Call poison control center or doctor immediately for treatment advice.

IMPORTANT: Pool Owner, save this manual. Builder, leave this manual with the pool owner.

EPA Reg. No. 67712-15
EPA Est. No. 67712-FL-001



Thank you for purchasing Nature2 Spa. Please take a few moments to review the material in this manual. We believe the more you know, the more enjoyable your hot tub experience will be and the more you will reduce the time, effort and cost of maintaining your spa. While every spa has its own characteristics of water type, amount of sunlight, etc. the recipe included in this manual will help ensure good water quality in any spa. If you have questions, your Nature2 Spa dealer can provide professional advice and service.

Directions for Use

It is a violation of Federal law to use this product in a manner inconsistent with its labeling.

Nature2 Spa Compatibility

Attention: Not to be used with product containing bromine, sodium bromide, or biguanides. If these products are being used, be sure to drain and refill the spa with fresh water.


Before using a new Nature2 Spa, clean debris and algae out of the spa and spa equipment.
Important: Do not install the new Nature2 Spa until the spa water is clean and chemically balanced.

Balance the Water

To find out if your spa water is balanced, take a water sample to your dealer to be tested or ask your dealer to recommend a spa test kit for water balance. Consult with your Nature2 dealer for specific water balance instructions.

Proper Balance for Nature2 Spa:

• pH  7.2-7.6
• Calcium Hardness  200-400 ppm
• Total Alkalinity  80-120 ppm
• Total Dissolved Solids (TDS)  300-2000 ppm



Element: pH

Range: 7.2-7.6

If too low:

 The surface of your spa can become etched. Metal parts in the pump and plumbing will corrode.

How to fix: Add pH increaser.
If too high:

"Scale" forms on the surface of your spa. The water can become cloudy. Equipment can become damaged.

How to fix: Add pH decreaser.


Element: Calcium Hardness

Range: 200-400 ppm

If too high:

Rough, discolored deposits ("scale") will form on the spa surface and inside spa equipment.

How to fix:

Drain or dilute the spa water. Consult your dealer.


Element:Total Alkalinity

Range: 80-120 ppm

If it's too low:

It provides no buffer so that you constantly get fluctuating pH readings, which can damage equipment and spa surfaces.

How to fix: Use an alkalinity increaser.
If it's too high: The water becomes cloudy or milky white.
How to fix: Add acid to bring alkalinity down.

Install the Nature2 Spa

The Nature2 Spa is designed to fit most portable spas. Zodiac assumes no liabilities for the product if installed in any way other than the methods described in this manual.

  1. Drain and refill your spa. Balance the water per spa manufacturer guidelines.
  2. Install the Nature2 Spa after water is balanced. Refer to Assembly and Installation Diagrams below for instructions regarding your particular model's installation.
  3. Superoxidize the spa water with an EPA registered source of chlorine according to manufacturer's instructions to burn off contaminants and activate cartridge. Important: Initial superoxidation with dichlor1 is required to burn off contaminants and activate cartridge.
    • Add 1.5 tablespoons of dichlor to spa per 250 gallons (approx. 1000 liters). Note: 1.5 tablespoons is approximately 3/4 oz or 24 grams.
    • Do not enter the spa if the free available chlorine residual is over 5 ppm.
  4. Run spa according to recommendations supplied to you by the manufacturer of your spa.


The Nature2 Spa comes in three parts; the main body (A) and two support stems (B, and C).

1 Connect the support stems together and press onto main body to create a single device as shown.

2. Slide the entire device into the core of your existing spa filter cartridge. See examples below.
Open Top: Slide unit in from the top. Position near the top half of the cartridge. (Support stems may be cut to position the cartridge correctly.)
Open Top with Stand Pipe: Some spa filter systems are configured with a standpipe running the length of the filter core. Simply slide unit in from the top. Position near the top half of the cartridge for easy retrieval.
Closed Top: Slide unit in from the bottom. Position unit to rest on shelf inside filter core.

When installed, the Nature2 Spa must be at least 1" (2.5 cm)
above the bottom of the filter to prevent blocking water flow.

Operation and Maintenance

This is one recipe for maintaining clean, clear, sanitized water with minimum time and effort. This recipe provides the easiest and most economical way to care for your Nature2 Spa.

Low-Chlorine Recipe


Follow the simple steps below to maintain your Nature2 Spa.

When: What to do:
Every day

Run spa according to recommendations supplied to you by the manufacturer of your spa.

Before each use Test the water with Nature2 Spa Test Strip (or equivalent). If the MPS2 level is low, add 1 tablespoon of MPS2 to spa per 250 gallons (approx. 1000 liters). Note: 1 tablespoon is approximately 1/2 ounce or 16 grams Use the Nature2 Spa Test Strip (or equivalent) to test the spa water after each addition of MPS2. If the test strip indicates levels below the OK range, add 1 tablespoon MPS2 to spa per 250 gallons and re-test. Enter spa only after test strip indicates a sufficient level of MPS2.
After each use

Add 1 tablespoon of MPS2 to spa per 250 gallons (approx. 1000 liters).

Once per week

Adjust the pH, total alkalinity, and hardness as needed. A convenient way to test pH and total alkalinity is the Nature2 Spa Test Strip.

Every 4 months  Drain and refill your spa. Replace Nature2 Spa and repeat sanitizer start-up.
As needed

Shock treat with 1.5 tablespoons of an EPA registered source of dichlor1 per 250 gallons (approx. 1000 liters) to remedy problems which may occur when bathing loads are high, when successive MPS2 test strip reading indicate high demand, when water appears hazy or dull, when unpleasant odors or eye irritation occur, after heavy wind and rainstorms or if foam develops.

Note: As an alternative to MPS2, an EPA registered source of dichlor1 may be substituted: 1 tablespoon dichlor1 = approximately 3 tablespoons MPS2.
Important: Perform start-up procedures for spas which have been unused or unattended. The Nature2 Spa is not to be used with products containing bromine, sodium bromide or biguanides. If these products are being used, DRAIN AND REFILL SPA WITH FRESH WATER.

Filtration and Circulation

Follow the manufacturer's directions for keeping the circulating pump in good working order and operate it at least four hours a day. Consult your Nature2 Spa dealer for optimum run times.

Check the spa filter periodically and clean it as recommended by the manufacturer.

1 Sodium dichloroisocyanurate dihydrate
2 Potassium peroxymonosulfate
3 MPS may cause a lowering of the pH and total alkalinity of your spa water. Please monitor pH and total alkalinity at least once per week and adjust accordingly.
4 Nature2 Spa Test Strips are available at your local Zodiac Nature2 Dealer.



Nature2 Spa Replacement

Use the month indicator decal to identify the date on which the cartridge should be replaced. 

Always turn spa off prior to installing or changing Nature2. Your spa is operated under pressure and the pressure must be released before you begin work. Please see your spa owner's manual for further instructions.

A cartridge lasts four (4) months. The cartridge should not be used longer than four (4) months.

Nature2 Disposal

After four months of use, discard Nature2 Spa in household trash. Do not save the cartridge for re-use. The cartridge is manufactured with the mineral media sealed inside. In the unlikely event a cartridge breaks, remove it and vacuum out any media introduced into the spa.



Nature2 Spa Limited Warranty

The limited warranties contained within this document are the only warranties given with your Nature2 Spa and supercede any prior warranties. All other warranties, expressed or implied, including the implied warranty of merchantability or the implied warranty of fitness for a particular purpose are hereby disclaimed. Our sole obligation under this warranty, and the purchaser's sole remedy, is limited to repair or replacement of the Nature2 Spa. The Nature2 warranty applies to the original owner only.


Nature2 Spa is warranted to be free of defects in materials and to perform satisfactorily for a period of four months from the date of purchase. Nature2 Spa is warranted not to cause staining in your spa. This limited warranty requires that you exercise reasonable care of your spa and keep water in balance at all times. This limited warranty does not cover discoloration to chromium fittings. This warranty does not cover cartridges used with any biguanide products such as Revacil®5, Baquacil®6, SoftSwim®7 or any products containing Bromine or bromine-based chemicals. If the cartridge is defective and does not perform satisfactorily for the entire four months, we will replace the cartridge.


Nature2 Spa is designed for use on residential portable spas up to 500 gallons. If it is used in any other application, the warranty is void, and the purchaser and/or spa owner releases the manufacturer from any and all claims related to the use of the Nature2 Spa.

This warranty does not cover problems arising in whole or in part from purchaser's negligence, misuse or abuse, improper maintenance or storage, accident, improper installation, improper application, failure to follow all appropriate safety precautions, Acts of God, abnormal weather conditions, damage from plants or animals, and improper use of chemicals.

This warranty specifically excludes all incidental or consequential damages, except where state law requires them to be paid. This warranty gives you specific rights. You may have other rights that vary from state to state.


Report claims to Zodiac Pool Care, Inc. by calling 1-800-822-7933. Only the original purchaser may submit a claim under this limited warranty. Claims must be accompanied by an original purchase receipt.

5 Revacil is a registered trademark of Mareva, Inc.
Baquacil is a registered trademark of Arch Chemical Inc.
SoftSwim is a registered trademark of Chentura, Inc




Use the guide below to correct common spa issues. For further assistance, consult your Nature2 dealer or call 1-800-822-7933.

  Problem What to look for Treatment
Cloudy water
Frequently caused by improper start up. See section on Start Up and Install the Cartridge
Spa filtration Slow filter turnover rates
  1. Backwash and/or clean filter.
  2. Run filter for 24 hours.
  3. Increase run time per day.

Algae growth

Hazy spa water; may have slightly green appearance. Superchlorinate water with EPA registered source of dichlor1 according to manufacturer's instructions.
Unbalanced water
  1. High hardness
  2. High TDS (total dissolved solids)
  3. High pH
  4. High total alkalinity
Balance the spa water.
Algae may be caused by insufficient levels of oxidizer and/or inadequate water circulation.
Green or white algae Pea green to white color; attaches to spa walls, sometimes colors the entire body of water.
  1. Check pH and adjust if necessary
  2. Superchlorinate water with EPA registered source of dichlor1 according to manufacturer's instructions.
  3. Repeat steps 1 and 2 until algae is gone.

Note: Do not use algae treatments containing either copper or sodium bromide.

Stains Blue/green

Copper or iron from spa equipment corrosion or water supply

  1. Adjust pH and total alkalinity to ideal ranges.
  2. Vigorously brush stained areas.
  3. Add sequestrant.
  4. Run filter.
  5. Twelve hours later, superchlorinate the spa.
  6. Test and balance water.
  7. Test spa water for dissolved metals.

Iron or manganese from equipment corrosion or water supply.

Black Manganese in water supply.
Metal tarnishing

High native mineral content in water; unbalanced water

Clean with soft cloth and mild detergent.
Test water for minerals; use a sequestrant
maintain water balance.
Scale  Crusty deposits on spa surfaces High pH and high total alkalinity Adjust pH and total alkalinity to ideal ranges.

High TDS (total dissolved solids) or high hardness

  1. Replace a volume of spa water with water low in hardness and dissolved solids.
  2. Use sequestrant to prevent scale buildup if high hardness is a continuing problem.
  3. If remedial action has been taken, and problem still persists, drain and refill spa.

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