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Hot Tub Chemicals Guide

 

inflatable hot tubs


Explore our Hot Tubs Chemicals Guide and find out everything from recommended chemical dosage amounts to chemical how-to guides.

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    Hot Tub Chemicals Quick Start Guide

    Setting up your hot tub for the first time? Start enjoying your hot tub in just three easy steps.
    1. SHOCK DOSE - ADD COMMISSIONING OR NORMAL SHOCK DOSE OF CHLORINE

      Before using your spa, Shock Dosing the water in your Lay-Z-Spa kills any bacteria from the start. It will also help to extend the time until you have to replace the water (assuming a good chemical maintenance schedule). Find out how to carry out this shock dose in our Shock Dosing How-to Guide.

       

    2. TEST WATER AFTER 24 HOURS

      After a commissioning shock dose you usually have to wait around 24 hours before the water is safe to use.

      It is essential to test the water every time before getting in. When it comes to water testing we recommend using Clearwater 3 way Dip Test Strips. Using Clearwater Dip Test Strips you are able to quickly and accurately assess your spa’s water conditions and make adjustments to the chemical levels as required.

      This may require you to adjust your pH, Alkaline  and Chlorine  levels. Dosage amounts will vary.

       

    3. START YOUR REGULAR ONGOING CHEMICAL REGIME

      In order to maintain clear, clean and healthy water there are some Daily, Weekly and Monthly Chemical Tasks that you will need to undertake.

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    Daily, Weekly & Monthly Hot Tub Chemical Care

    Explore our daily, weekly, monthly and ad-hoc hot tub chemical duties and caring information.

    Daily Chemical Duties

      1. Keep Your Lay-Z-Spa On

        Turn on your Lay-Z-Spa and activate the filtration system to ensure your spa stays continuously filtered.

        By leaving your spa on the filter cartridge will collect suspended dirt and oils. This together with chemical water treatment will help you maintain clean and healthy water.

         

      2. Water Testing & Daily Adjusting of Chlorine & pH Levels

        Chemicals will still get used up and will be constantly changing, even if you haven't used the spa. We recommend testing the water 1-2 hours before you plan to use it to give you time to make any chemical adjustments if required.

        This test can be carried out by using a Clearwater 3 Way Dip Test Strip.

        An overview of the recommended levels for Total Alkalinity, Free Chlorine and pH can be found below:

        Total Alkalinity
        For more information on how to test your Total Alkalinity visit our How-To Guides.

        TESTIDEAL READINGTERMS
        Total Alkalinity 125 - 150ppm* *ppm = parts per million

        Free Chlorine Testing
        For more information on how to test your Chlorine visit our How-To Guides.

        TASKIDEAL LEVELPRODUCTDOSE FREQUENCY
        Chlorine 1 - 3 ppm (aim for 3) ClearWater Stabilised Chlorine Granules Daily when pool in use to maintain ideal levels

        pH Levels
        For more information on how to test your Total Alkalinity visit our How-To Guides.

        TASKIDEAL LEVELPRODUCTDOSE FREQUENCY
        pH 7.2 - 7.6 ClearWater pH Minus to reduce.
        ClearWater pH Plus to increase
        Weekly or as required to maintain ideal levels

         

      3. Check Filter Cartridge

    Depending on variety of factors from hardness of water to in water debris you will need to clean your Filter Cartridges every day or every few days (this is based on constant use). This will not only ensure that your spa stays clean, it will also prolong the life of your cartridges.

      • · Cleaning your Filter:
        • · To do this, ensure your pump is switched off, unplugged and the filter hoses have been removed. To prevent water escaping, use stop plugs when unplugging the hoses from your liner.
        • · Remove the filter cartridge from the filter pump. If it’s dirty, give it a light rinse with a garden hose. If this fails to clean the cartridge, you should replace it with a new one.
          • · Also place a dry filter back into the spa, not the freshly washed filter

    Weekly Chemical Duties

    Every week there are a number of recommended activities you should carry out in order to prolong the life of your Lay-Z-Spa’s water.

     

    Shock Dose

    Lay-Z-Spas are smaller than pools and are shared by more people, meaning a greater amount of contaminants are brought into the water. As a result, it’s recommended that you shock treat the water once a week during periods of heavy use. Find out how to do this in our Shock Dosing Guide. During periods of less heavy use the spa will not need to be shocked as regularly. After testing with a Clearwater 3 Way Dip Test use Clarifier to ensure the clarity of the water.


    Clarifier

    ClearWater Clarifier contains flocculants which bind small particles of debris and algae together making it easier for your Lay-Z-Spa’s filtration system to capture and filter algae in spa’s water.

     

    Monthly Chemical Duties

    Every month you will need to carry out the following to maintain water hygiene.

     

    Replace the Water

    The frequency of water changes should reflect the degree of use of the pool, as well as the results of chemical testing. If chemical levels have fallen far outside the normal ranges, it is recommended that the water is completely replaced and re-treated.

     

    Ad-Hoc Chemical Duties

    Some chemicals will need to be added depending on chemical reactions in the spa.

     

    Foam Remover

    We always recommend that you shower before entering your hot tub. This is because your body includes shampoos, deodorants and natural body oils which can cause chemical imbalances. Despite showering we understand that these body substances are still sometimes present and will react with the water resulting foam being produced.

    We therefore recommend that you add ClearWater Foam Remover in order to prevent and control this foaming.

     

  • Chemical How-To Guides

    Chemical Dosage & How-To Guides

    Get help with Shock Dosing, Alkalinity, pH and Chlorine chemical dosage levels.

    Managing your Lay-Z-Spa’s chemicals levels seems like a daunting task but in fact it is straightforward as long as you test in the right order and react accordingly to the results of your tests.


    ALKALINITY

    When it comes to hot tub chemistry, the first thing you want to check is the water’s alkalinity. The total alkalinity (TA) is a measure of the capacity of your spa water to neutralize the water when it becomes too acidic.

    You therefore want to check this before your pH levels because a proper alkalinity level will help to prevent fluctuations in the pH level.

     

    HOW TO Balance TOTAL ALKALINITY LEVELS

    To determine your Total Alkalinity levels use ClearWater 3 Way Dip Tests you are able to quickly and accurately assess the condition of your water. The ideal level for Total Alkalinity is between 80ppm and 160ppm.

    1. Grab a testing strip. Determine your pH levels by using ClearWater 3 Way Dip Tests. When removing the strips from the bottle, take care not to touch any of the other strips.

    2. Dip the strip into your hot tub. Dip the test strip in the water, just long enough to get it wet, and remove. Now compare the displayed colour to the colour chart on the back of the kit. Be careful to hold the strips level (to avoid indicator pad colours mixing).

    3. Total Alkalinity
      • · Too low. To correct low alkalinity levels (Below 80ppm), use Sodium Bicarbonate to increase the levels. Bicarb will help to raise the TA without excessively raising the pH. Care should be taken to increase the TA over a period of time, adding a maximum of 1 pound of bicarb for each 6,000 gallons of water. The bicarb can be added at this rate every 4 days, until the required level is reached.

      • · Too High. If the alkalinity levels are too high (Above 160ppm), use pH Minus to reduce it.

         

    PROBLEMS CAUSED BY UNBALANCED TOTAL ALKALINITY LEVELS

    Not balancing your Alkalinity levels can cause a number of issues which can take away from the enjoyment of your spa.

    HIGH TOTAL ALKALINITYLOW TOTAL ALKALINITY
    pH keeps going up despite regular addition of pH-down pH bounce (rapid fluctuations in pH).
    Cloudy water Corrosion of metal parts e.g. pump
    Burning eyes and itchy skin Staining of the pool's surfaces
    Reduced chlorine efficiency resulting in algae growth Green water
    Burning eyes and itchy skin;
    pH bounce (rapid fluctuations in pH).

    Remember, as you add chemicals to the hot tub, allow your water to circulate for a few hours (or overnight) before retesting for more accurate readings.

     

    pH

    Every day before entering your Lay-Z-Spa you will want to check your pH levels to measure how acidic or alkaline your water is. This is important as it will help to prevent a range of problems caused by pH levels which are too high or low.

     

    HOW TO BALANCE PH LEVELS?

    To determine your pH levels use ClearWater 3 Way Dip Tests you are able to quickly and accurately assess the condition of your water.

    1. Grab a testing strip. Determine your pH levels by using ClearWater 3 Way Dip Tests. When removing the strips from the bottle, take care not to touch any of the other strips.

    2. Dip the strip into your hot tub. Dip the test strip in the water, just long enough to get it wet, and remove. Shake any excess water off the strip and compare it to the color on the back of the kit. Be careful to hold the strips level (to avoid indicator pad colours mixing).

    3. When pH levels are too low or too high. If the levels are too low (below 7.2), use pH Plus to help raise the pH levels and balance the water. If the levels are too high (above 7.6), use pH Minus to help bring those levels back down into the recommended range.

    4. Add the appropriate chemical. Once you’ve determined whether or not you need pH Plus or pH Minus, follow the instructions on the back on the bottle. In most cases, you’ll be instructed to add a few capfuls of the chemical.

       

    PROBLEMS CAUSED BY UNBALANCED PH LEVELS

    pH measures how acidic or alkaline your water is. If it is not kept in check you run the risk of damaging your Lay-Z-Spa and causing some irritations. The most common problems associated with both high or low pH levels:

    HIGH pH READINGSLOW pH READINGS
    Poor Sanitizer Efficiency (Chlorine) Poor Sanitizer Efficiency (Chlorine)
    Cloudy Water Corroded Metals/Equipment
    Scale Formation Skin and Eye Irritation
    Shorter Filter Runs Etched or Stained Plaster
    Skin and Eye Irritations Destruction of Total Alkalinity

    When adding chemicals to your hot tub, remember that the amount of chemical you need will vary with each situation. The number of bathers, water hardness and other outside materials such as mud, grass, and leaves will all affect chemical requirements.

     

    CHLORINE

    Getting the Chlorine levels right in your spa are absolutely essential if you want to ensure your water stays safe and clean.

     

    HOW TO BALANCE Chlorine LEVELS

    Free Chlorine refers to the amount of chlorine in your spa that can sanitize or disinfect the water, keeping it safe for users and preventing algae or bacteria from forming. The ideal Chlorine level is 3-5ppm.

    To determine your Chlorine Levels use ClearWater 3 Way Dip Tests you are able to quickly and accurately assess the condition of your water.

    1. Grab a testing strip. Determine your pH levels by using ClearWater 3 Way Dip Tests. When removing the strips from the bottle, take care not to touch any of the other strips.

    2. Dip the strip into your hot tub. Dip the test strip in the water, just long enough to get it wet, and remove. Shake any excess water off the strip and compare it to the color on the back of the kit. Be careful to hold the strips level (to avoid indicator pad colours mixing).

    3. When Chlorine Levels are too low or too high. If the levels are too high (Above 5ppm) you will need to leave the water so it can naturally decrease over time and then retest. If the levels are too low (Below 3ppm), you will need to add the appropriate amount of chlorine to restore the balance. Please see the instructions included on the Chlorine Granules or Multi-Function Tablet packaging.

       

    PROBLEMS CAUSED BY UNBALANCED CHLORINE LEVELS

    There are a host of issues caused by getting your Chlorine levels incorrect. Not enough Chlorine can result in unhygienic bathing conditions, whereas high Chlorine levels can cause irritated eyes or skin.

    HIGH CHEMICAL READINGSLOW CHEMICAL READINGS
    Poor Sanitizer Efficiency (Chlorine) Poor Sanitizer Efficiency (Chlorine)
    Cloudy Water Corroded Metals/Equipment

    Remember, as you add chemicals to the hot tub, allow your water to circulate for a few hours (or overnight) before retesting for more accurate readings.

     Chlorine Recommendations Table

    The table below shows the recommended Normal Chlorine Shock Dose quantities for each model.

    Lay-Z-Spa ModelWater Volume at 80% (Litres)Chlorine Granules Daily Dosage
    GramsTeaspoons (one teaspoon approx. 5g)
    Bali 669 13 3
    New York AirJet 806 16 3
    Honolulu AirJet 916 18 4
    Riviera AirJet 935 16 3
    Havana Air Jet 669 13 3
    Tahiti AirJet 669 13 3
    Saint Tropez AirJet 935 8 2
    Vegas AirJet 935 8 2
    Monaco AirJet 1453 14 3
    Miami AirJet 669 13 1
    Palm Springs AirJet 916 8 2
    Hawaii HydroJet Pro 795 7 1
    Palm Springs HydroJet 795 7 1
    Paris AirJet 806 7 1
    Hawaii AirJet 840 8 2
    Siena AirJet 509 5 1
    Havana AirJet 669 13 0
    Maldives HydroJet Pro 1050 9 2
    St.Moritz AirJet 1190 11 5

     

    SHOCK DOSING

    Shocking your hot tub is essential for hot tub maintenance by helping to prevent the build of bacteria. By shock dosing your hot tub it reduces the need for high chemical doses; aids in eliminating bacteria, viruses, and algae; and prolongs the life of your spa.

     

    HOW TO SHOCK DOSE

    Experts recommend shocking your hot tub before first use and then at least once a week - initial setup only, should be maintaining levels daily so not required to keep your water clean and clear. In order to do this, follow these steps:

    1. Ensure that your spa is filled with water up to the recommended level.

    2. Turn on the Water Filtration System but ensure the massage system is turned off

    3. There are two types of shock dose:
      • · Commissioning Chlorine Shock Dose: This is the shock does you add to your spa when you first add water to it
      • · Normal Chlorine Shock Dose: This is the shock dose you add to your spa when it has already previously had a Commissioning Chlorine Shock Dose.

    4. Check the water capacity of your hot tub. The size of your hot tub will impact just how much chlorine you need to add to your spa. Use the Shock Dose Recommendations Table to see how much Chlorine you need to add.

    5. After shock treating your Lay-Z-Spa water, wait a minimum of 24hrs then test chlorine level. Bathing can start when chlorine level is 5ppm or less (ideal 3-5ppm).

    6. Wash your hands. Once you’re done shocking your hot tub, wash your hands to ensure none of the shock treatment is lingering on your fingers.

       

    SHOCK DOSE RECOMMENDATIONS TABLE

    The table below shows the recommended Commissioning Shock Dose quantities for each model.

    Lay-Z-Spa ModelWater Volume at 80% (Litres)Chlorine Granules Shock Dosage
    GramsTeaspoons (one teaspoon approx. 5g)
    Bali 669 13 3
    New York AirJet 806 16 3
    Honolulu AirJet 916 18 4
    Riviera AirJet 935 16 3
    Havana Air Jet 669 13 3
    Tahiti AirJet 669 13 3
    Saint Tropez AirJet 935 19 4
    Vegas AirJet 935 17 3
    Monaco AirJet 1453 31 6
    Miami AirJet 669 16 3
    Palm Springs AirJet 916 18 4
    Hawaii HydroJet Pro 795 16 3
    Palm Springs HydroJet 795 16 3
    Paris AirJet 806 16 3
    Hawaii AirJet 840 17 3
    Siena AirJet 509 10 2
    Havana AirJet 669 0 0
    Maldives HydroJet Pro 1050 21 4
    St.Moritz AirJet 1190 24 5

    Please note: The table is only applicable to Clearwater Chemicals. When it comes to shocking your hot tub, read the label to ensure you are conducting the spa shock correctly. Dosages are only approximate and the effect of chemicals on your water can vary each time you use them, depending on exact amount of water in your spa, water type, water temperature, positioning of spa etc. Therefore it is essential to test the water every time before you use it.

     

    SHOCK DOSING FAQs

    WHEN DO I NEED TO SHOCK MY SPA WATER?

    Your Lay-Z-Spa water should be shocked when:

    • · You first fill up your Lay-Z-Spa
    • · At the first signs of algae or slime
    • · After periods of heavy usage
    • · After a loss of water clarity or quality

    HOW OFTEN SHOULD I SHOCK MY SPA WATER?

    It is good practise to shock treat the spa water after a period of high usage. This will help to rectify the sanitizer level, prevent the growth of microorganisms and help maintain sparkling, crystal clear water. After treatment, water quality and clarity is often completely restored.

    We know that chemicals are a pretty confusing part of owning a hot tub, so we have made it super easy for you with shock doses depending on Lay-Z-Spa model and FAQs.


    I PURCHASED LARGE 200G CHLORINE TABLETS FOR MY LAY-Z-SPA. HOW MANY DO I NEED TO USE?

    These big tablets are designed for much larger swimming pools. Return them & exchange for Stabilised Chlorine Granules or small 20g Chlorine Tablets dosed with a floating dispenser OR Spa Chemical Starter Kit.


    I PURCHASED SMALL (20G) CHLORINE TABLETS FOR MY LAY-Z-SPA. HOW MANY DO I NEED TO USE?

    It is difficult to give an exact dosing rate, but start with 2 – 3 tablets and adjust the flow rate to achieve chlorine level of 3-5mg/l (ppm) for spas.


    I HAVE ADDED AN INITIAL DOSE OF STABILISED CHLORINE TO MY SPA, WHEN CAN I USE IT?

    The spa can be used when the chlorine level has dropped to 5mg/l (ppm) or below. This may take some time.


    I HAVE ADDED AN INITIAL DOSE OF STABILISED CHLORINE TO MY SPA. I AM GETTING STRANGE PH & TOTAL ALKALINITY READINGS?

    The chlorine level is still probably very high which can give inaccurate pH & TA readings. Wait for the chlorine level to drop to 5mg/l (ppm), then re-test pH & TA and if necessary adjust.


    THERE ISN’T A MEASURING SCOOP IN THE CHEMICAL CONTAINER. HOW DO I MEASURE OUT THE QUANTITY I NEED?

    A level teaspoon holds approx. 5g of dry product. Never use the same teaspoon to measure different chemicals without cleaning thoroughly first.


    HOW OFTEN DO I NEED TO ADD STABILISED CHLORINE GRANULES TO MY SPA?

    The Stabilised Chlorine Granules should be added daily to achieve the recommended chlorine level of 3-5mg/l (ppm) for spas.


    I HAVE PURCHASED A STARTER KIT FOR MY LAZY SPA, WHEN DO I ADD THE ALGAECIDE?

    You have purchased a Pool Starter Kit rather than a Spa Starter Kit. You do not need to add algaecide to a spa.


    I NEED TO BUY MORE CHEMICALS, WHERE CAN I PURCHASE THEM FROM?

    You can purchase further hot tub chemical supplies from the website.


    WHY AM I NOT GETTING A CHLORINE READING ON MY TEST STRIPS?

    Have you added any chlorine recently?

    Yes, an initial dose for my spa – The chlorine level may still be high leading to bleaching of the test strip pads. Leave for 24 hours and re-test.

    No, I added chlorine a couple of days ago. Chlorine gets used even if the pool/spa isn’t being used. Dose Stabilised Chlorine Granules daily.

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    Water Problem Solving Chart

    Find out the causes and solutions to an water issues your hot tub may be experiencing.

    Water issues may seem like a difficult task to resolve, but by using our Water Problem Solving Chart below you can easily identify the causes and remedy.

    SYMPTOMCAUSEREMEDY
    Green / Cloudy Water / Slippery Sides Algae Shock dose with chlorine (see start up dose) and add Algaecide
    Too much chlorine Overdose Allow time to naturally dissipate or buy a chlorine reducer
    PH hard to control Alkalinity low Seek advice on how to raise total alkalinity
    Can't maintain chlorine levels Chlorine demand of water too high up start up, after holidays or due to excess contamination or neglect Shock dose with chlorine (see start up dose on product instructions). Repeat after 24 hours if necessary
    Cloudy water Poor chemical control or inadequate filtration Clean or replace filter cartridge, check chemical levels using either ClearWater Dip Test Strips or a Bestway Aquatester. Adjust if necessary (chlorine/PH). If problem persists buy a clarifier to remove small particles
    Rough pool sides / edges Scale formation due to high calcium levels in water Ensure PH levels are correct using ClearWater Dip Test Strips or Bestway Aquatester and use a pool scale inhibitor to stop calcium precipitating out of water
    No colour change on test strip dip test Too high chlorine leading to bleaching of indicator pads (over 15ppm chlorine) Check expiry date on ClearWater Dip Test Strips. Wait for chlorine level to drop and re-test
    Foaming Detergent present from incorrect cleaning products or excessive algaecide use Reduce water level and top up with fresh water. Avoid domestic household cleaners.You can also use Clearwater Foam Remover if the problem persists.
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    Chemical Handling & Storage

    Explore our hot tub chemical handling and storage advice.

    Ensuring yours and others’ safety when handling chemicals is highly important as failure to do so could cause serious harm or death. Please therefore read the below instructions carefully on how to correctly store and handle chemicals.

    CHEMICAL HANDLING

    • · Read instructions thoroughly on each product/box before use
    • · When pre dissolving chemicals always add chemicals to water and not vice versa
    • · Never mix different chemicals in concentrated forms including these kit products but also with other products like bleach or weedkillers – a dangerous reaction may occur
    • · Always pre-dissolve chemicals in a clean,plastic container in a well ventilated area
    • · Always add the chemicals to water
    • · Avoid spillages but in event of spillage clean up using clean receptacles and dispose in the pool. Flush cleaned spill areas with water
    • · Never use unlabelled chemicals
    • · Wash hands after handling chemicals
    • · Have a First Aid Kit available for any accidents
    • · For general safety advice on using your Lay-Z-Spa please refer your manual

    STORING CHEMICALS

    • · Store chemicals well away from children and pets
    • · Store in a secure, cool and dry place
  • Quick start Icon

    Chemicals & What They Do

    Explore the full list of Lay-Z-Spa ClearWater chemicals including their key properties and uses.

    ClearWater is our chosen and recommended chemical provider. Developed with Lay-Z-Spa in mind, the range of ClearWater Chemicals includes everything needed to make sure your spa’s water stays safe, clean and clear. Explore the table below which includes each product’s use and function.

    CHEMICAL OR ACCESSORY:FORMFUNCTION
    Clearwater Chlorine Granules Granules Clearwater Chlorine Granules are one of our most popular products and are widely considered an essential item in every hot tub owner’s tool kit. Chlorine granules disinfect the spa water by killing bacteria which builds up in your Lay-Z-Spa. They are quick dissolving and relatively pH neutral.
    Clearwater Dip Test Strips Strip Clearwater Dip Test Strips are a quick, easy but essential way to check the chlorine, pH and alkalinity levels of your spa water, allowing you to provide it with the right treatment if necessary. Untested water can develop a chemical imbalance which may result in an unhygienic swimming environment or skin irritations. Simply dip a test strip into your hot tub water, quickly remove it and allow the colour to develop. The results can be checked against the colour chart provided, indicating each level.
    Clearwater Mini Multifunction Tablets Tablet Clearwater Mini Multifunctional Tablets are an effective and hassle-free way of maintaining clear and healthy spa water. They contain a combination of chemicals that act in a number of ways. These slow release tablets contain chlorine, algaecide and water clarifier. The chemical dispenser slowly releases the mini tablets into the water, making this a completely hassle-free way of treating your water even for the user with a busy schedule.
    Bestway 5 inch Chemical Floater Chemical Tablet Dispenser The 5 Inch Chemical Floater slowly releases Clearwater Mini Multifunctional Tablets or Chlorine Tablets, making it the perfect accessory for busy spa users who want a hassle free way of maintaining clear and healthy spa water. The dispenser has an adjustable dial which controls the release of the 20g tablets, ensuring that the sanitizer level of your spa water is consistently and efficiently maintained.
    Clearwater pH Plus Granules Clearwater pH Plus, also known as ‘pH increaser’ is the best way to increase pH levels that have dropped below the recommended level. To avoid skin discomforts and enable the chlorine in your spa to work effectively, it’s vital that acidity is monitored and controlled. The recommended pH balance of spa water is between 7.2 and 7.6.
    Clearwater pH Minus Granules Clearwater pH Minus, also known as ‘pH reducer’ is the most simple and effective way to decrease the pH of your spa water when it has surpassed the recommended level.
    Clearwater Clarifier Liquid Clearwater Clarifier contains flocculants which bind small particles of debris and algae together so that your Lay-Z-Spa filtration system can adequately remove them, resulting in clean and sparkly water. This is a very effective way of preventing your spa water from looking dull and cloudy, due to the build-up of dead algae and debris that is too small to be trapped by your filter. Even if you have treated your spa for algae using Clearwater Algaecide, it is recommended that you use the Water Clarifier to remove any residual debris.
    Clearwater Algaecide Liquid Clearwater Algaecide is the quickest and most effective way to eliminate and prevent the build-up of algae, which provides an ideal breeding ground for germs and bacteria.
    Clearwater Foam Remover Liquid Clearwater Foam Remover is designed to control and prevent foaming in your hot tub, which is typically caused by the reaction of water with shampoos, deodorants and natural body oils present on the user.
    Scale and Stain Liquid

    Clearwater Scale and Stain Remover is great for hard water areas.