Hot Tub Chemicals Guide


Explore our Hot Tub Chemicals Guide and find out everything you need to know from recommended chemical dosage amounts to chemical how-to guides.

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

After filling with water and before using your hot tub, 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 shock dose your hot tub in our Shock Dosing How-to Guide below.

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 hot tub water there are some Daily, Weekly and Monthly Chemical Tasks that you will need to undertake.


Chemicals Quick Start Guide
Lay-Z-Spa Chemical Care

Daily, Weekly & Monthly Chemical Care

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

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. We recommend the spa is filtered for a minimum of 4 hours a day.

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. Test Chemical Levels before use
 
If your chlorine, alkalinity or pH levels are not correct, please refer to our chemical How To guides below


3. Check Filter Cartridge

It is advised that filter cartridges are changed or cleaned after every use of. If the spa has not been used, the filter should be checked when the chemicals are tested daily.

How to clean your hot tub filter:

1. Ensure your pump is switched off
2. Remove the filter housing from your liner including the backplate
3. Unscrew the filter housing and remove the cartridge.
4. Wash off the cartridge with a garden hose or cool tap water and leave to dry. Do not use any detergent or washing-up liquid to clean the filter.
5. Replace the cartridge with either a new or clean and dry one in the spa. Do not use a wet filter cartridge as this will not clean the spa effectively.


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

Hot tubs 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 give a shock treatment to the water once a week during periods of heavy use. Find out how to do this in our Shock Dosing Guide below. During periods of less heavy use, the spa will not need to be shocked as regularly. After shocking, test the water with a Clearwater 3 Way Dip Test use Clarifier to ensure the clarity of the water.


Clarifier

ClearWater Clarifier contains flocculants that 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 the spa’s water.


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 hot tub, 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.

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 to reduce residue from products such as shampoo, deodorant, washing detergent, sun lotion, moisturiser, make-up, fake tan and natural body oils which can cause chemical imbalances. Despite showering we understand that these substances are still sometimes present and will react with the water resulting in foam being produced. In order to resolve, prevent and control this we would recommend that you add Clearwater Foam Remover to your spa.


Chemicals Dosages & How-To Guides

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

Managing your Lay-Z-Spa’s chemicals levels may seem 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.

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 Alkalinity level we recommend using ClearWater 3 Way Dip Tests These will accurately assess the condition of your water.

1. Use a testing strip to determine the Alkalinity levels. When removing the strips from the bottle, take care not to touch any of the other strips and make sure the strips are not damp.

2. Dip the test strip in the water as near to the centre of the spa as you can. Remove the strip quickly and compare the colour display to the colour chart on the side of the kit. Be careful to hold the strips level to avoid indicator pads mixing.

3. Total Alkalinity results:

Too Low – To correct low alkalinity levels (below 80ppm) you will need to use Total Alkalinity Increaser
Too High – To correct high alkalinity levels (above 160ppm) you will need to use PH Minus

The dosage information will be printed on the individual chemical bottles.


Problems Caused By Unbalanced Total Alkalinity Levels

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

HIGH TOTAL ALKALINITYLOW TOTAL ALKALINITY
pH keeps going up despite regular addition of pH-MinuspH bounce (rapid fluctuations in pH)
Cloudy waterCorrosion of metal parts e.g. pump
Burning eyes and itchy skinStaining of the liner's surfaces
Reduced chlorine efficiency resulting in algae growthBurning eyes and itchy skin
Green water

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 we recommend using ClearWater 3 Way Dip Tests. These will accurately assess the condition of your water.

1. Use a testing strip to determine the PH levels. When removing the strips from the bottle, take care not to touch any of the other strips and make sure the strips are not damp.

2. Dip the test strip in the water as near to the centre of the spa as you can. Remove the strip quickly and compare the colour display to the colour chart on the side of the kit. Be careful to hold the strips level to avoid indicator pads mixing.

3. PH Level results:
Too low - (below 7.2), use pH Plus to help raise the pH levels and balance the water.
Too high - (above 7.6), use pH Minus to help bring those levels back down into the recommended range.
The dosage information will be printed on the individual chemical bottles.


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 WaterCorroded Metals/Equipment
Scale FormationSkin and Eye Irritation
Shorter Filter Runs
Etched or stained liner 
Skin and Eye IrritationsDestruction 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. We would always advise you re-test the water before using your spa.

Getting the Chlorine levels right in your hot tub is 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, we recommend using ClearWater 3 Way Dip Tests. These will accurately assess the condition of your water.

1. Use a testing strip to determine the chlorine levels. When removing the strips from the bottle, take care not to touch any of the other strips and make sure the strips are not damp.

2. Dip the test strip in the water as near to the centre of the spa as you can. Remove the strip quickly and compare the colour display to the colour chart on the side of the kit. Be careful to hold the strips level to avoid indicator pads mixing.

3. Chlorine level results:

  • Too high – (above 5ppm) we would suggest using the overdose troubleshooting below.
    Drain spa to minimum mark and re-fill with fresh water to the maximum mark, this will help to dilute the excess chemical. Or, remove the cover from the hot tub to allow evaporation of the chemical (keep the spa filter running constantly).

  • 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. If the levels are very low we would suggest shock dosing the spa.



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 WaterCorroded 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 Daily Chlorine Shock Dose quantities for some of the models, as examples.

Lay-Z-Spa ModelWater capacity in Litres
Grams based on 9g per 1000 litres

Teaspoons (one teaspoon = approx. 5g)
St Lucia AirJet60551
Bali AirJet
Bahamas AirJet
Havana AirJet
Barbados AirJet
Tahiti AirJet
Cancun AirJet
Fiji AirJet
Madrid AirJet
66961
New York AirJet
Paris AirJet
80671
Honolulu AirJet
Milan AirJet Plus
Palm Springs AirJet
91682
Vegas AirJet84882
Miami AirJet80071
Ibiza AirJet77871
Hawaii AirJet84082
St Moritz AirJet1190112
Helsinki AirJet1123102
Hawaii HydroJet Pro
Majorca HydroJet Pro
79571
Singapore AirJet Plus
Vancouver AirJet Plus
80471
Maldives HydroJet Pro
Palma HydroJet Pro
105092

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 the 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.

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. We would recommend chlorine granules are used for this treatment. 


How To Shock Dose Your Hot Tub

We recommend shocking your hot tub before first use and then once a week on initial set up. You should check the levels daily in order to keep your water clean and clear. To shock dose your spa, follow the steps below:

1. Ensure that your spa is filled with water up to the recommended level.
Turn on the water filtration system but ensure the massage seam is off.

2. Check the water capacity of your hot tub. The size of your hot tub will impact how much chlorine you need to add to your spa. Use the shock dose recommendations table below to see how much chlorine you need to add to your spa.

3. Add the recommended dosage to a small clean bucket/jug of clean water. Dissolve the chlorine and then add this water to your spa. Do not use this bucket/jug for anything other than chemicals. See chemical handling and storage information for further safety advice.

4. After the shock treatment you will need to wait a minimum of 24 hours. Please then test the chlorine level with the dip test strips before using the spa. The ideal levels are 3-5ppm for chlorine.


Shock Dose Recommendations Table

The table below shows the recommended Commissioning Shock Dose quantities for some models - as an example.

Lay-Z-Spa ModelWater capacity in LitresGrams based on 20g per 1000 LitresTeaspoons (one teaspoon = approx. 5g)
St Lucia AirJet605122
Bali AirJet
Bahamas AirJet
Havana AirJet
Barbados AirJet
Tahiti AirJet
Cancun AirJet
Fiji AirJet
Madrid AirJet
669133
New York AirJet
Paris AirJet
806163
Honolulu AirJet
Milan AirJet Plus
Palm Springs AirJet
916184
Vegas AirJet848173
Miami AirJet800163
Ibiza AirJet778164
Hawaii AirJet840174
St Moritz AirJet1190245
Helsinki AirJet1123224
Hawaii HydroJet Pro
Majorca HydroJet Pro
795163
Singapore AirJet Plus
Vancouver AirJet Plus
804163
Maldives HydroJet Pro
Palma HydroJet Pro
1050214

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 the 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.

When Do I Need To Shock Dose My Water?

Your Lay-Z-Spa water should be shocked when:
· You first fill up your Lay-Z-Spa with water
· At the first signs of algae or slime
· After periods of heavy usage
· After a loss of water clarity or quality
· After a long period without use
· When you re-fill with fresh water

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 as this depends on water type, the size of your spa, how much the spa is used along with other factors. We would advise starting with 2 tablets and adjust the flow rate to achieve a chlorine level of 3-5mg/l (ppm) for your spa.

I have added An Initial Dose Of Stabilised Chlorine To My Lay-Z-Spa, When Can I Use It?

The spa can be used when the chlorine level sits between 3-5ppm. You should allow at least 24 hours for any treatment to the water to dissolve fully and be safe to use.

I Have Added Am Initial Dose Of Stabilised Chlorine To My Lay-Z-Spa. Why I Am Getting Strange pH & Total Alkalinity Readings?

The spa can be used when the chlorine level sits between 3-5ppm. You should allow at least 24 hours for any treatment to the water to dissolve fully and be safe to use.

Lay-Z-Spa Chemical Dosage
Hot Tub Water Problem Solving

Water Problem-Solving Chart

Find out the causes and solutions to 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 sidesInadequate sanitiser. Algae may be presentShock dose with chlorine (see shock dose table) and add foam remover or clarifier.
Too much chlorineOverdose

1. Drain spa to minimum mark and re-fill with fresh water to maximum mark, this will help to dilute the excess chemical.  

2. Remove the cover from spa to allow evaporation of the chemical (keep the spa filter running constantly).

PH hard to controlAlkalinity lowAdd Total Alkalinity Increaser – see packaging for dosage information
Can't maintain chlorine levelsChlorine demand of water too high at start up, after holidays or due to excess contamination or neglect


1. Shock dose with double dose of chlorine.

2.
Use the test strips to check chemical levels every day, the filter pump should be left on for a minimum of 4 hours a day when there is water in the hot tub.

3. If chlorine levels are fluctuating, you will need to check other chemical levels are correct. If the hot tub is being used quite a lot you may need to increase the chlorine levels.

4. If you are going away we would suggest emptying the hot tub and cleaning it so the water is not left to go stagnant. Do not re-fill until you return from your trip.

Cloudy waterPoor chemical control or inadequate filtrationClean or replace the filter cartridge, check chemical levels using ClearWater Dip Test Strips. Adjust if necessary (chlorine/PH). If the problem persists buy a clarifier to remove small particles.
Rough pool sides / edgesScale formation due to high calcium levels in waterEnsure PH levels are correct using ClearWater Dip Test Strips.
No colour change on test strip dip testToo high chlorine leading to bleaching of indicator pads (over 15ppm chlorine)Check the expiry date on ClearWater Dip Test Strips. Wait for chlorine level to drop and re-test.
FoamingDetergent present from incorrect cleaning products or excessive algaecide useReduce water level and top up with fresh water. Avoid domestic Household cleaners. You can also use Clearwater Foam Remover if the problem persists.

Chemical Handling & Storage

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.

Read Instructions Thoroughly On Each Product Before Use

Never use unlabelled chemicals and please read the instructions before use. Avoid getting chemicals in eyes, on skin or on clothing. Avoid breathing vapours when opening a container. Avoid creation of dust. Never add water to the product. Always add product to large quantities of water. Use separate clean dry utensils for each chemical and clean after use. Do not add the product to any dispensing device containing residuals of other products.


Wear Protective Clothing

When you’re ready to begin mixing your chemicals, you should handle them with chemical resistant gloves. The glove material has to be impermeable and resistant to the product/ the substance/ the preparation. It is also advised to wear tightly sealed goggles and appropriate protective clothing such as long sleeves, trousers, and closed-toed shoes that fully protect your feet from spills. You should also wash your hands after handling chemicals.

 

Spillages & Disposal

In the event of spillage, clean up using clean receptacles and dispose of carefully. Do not add water to spilled materials. Do not use floor sweeping compounds to clean up spills. Sweep and scoop spilled material into clean, dedicated equipment.

Every attempt should be made to avoid mixing spilled material with other chemicals or debris when cleaning up. Do not attempt to reseal any contaminated drums. Do not transport wet or damp material.

Adding Or Pre-Dissolving Chemicals

Always pre-dissolve chemicals in a clean, plastic container in a well-ventilated area. When pre-dissolving chemicals always add chemicals to water and not vice versa. Always add the chemicals to the water.

Never mix different chemicals in concentrated forms. This includes the kit products but also with other products like bleach or weedkillers – a dangerous reaction may occur.


Safety

Do not eat, drink or smoke when using this product. Have a First Aid Kit available for any accidents

- If inhaled: Seek fresh air and keep at rest in a position comfortable for breathing.
- If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. If eye irritation persists: Get medical advice/attention.
- If swallowed: Get medical advice/attention or call a poison centre.

For general safety advice on using your Lay-Z-Spa or chemicals, please refer your manuals.

Safe Storage

Store in a secure, cool and dry place. Chemicals must be kept well away from children and pets. Always keep chemicals in original packaging.

Avoid Exposure to Sunlight and Humidity

When considering where to store your chemicals, the best storage locations are areas out of direct sunlight. Chemicals react poorly when in contact with sunshine and heat and require a dark, cool environment to control for any potential reactions.

Make sure that any outdoor storage of chemicals is as far away from your hot tub as possible and in a dry, covered area. Humidity or even small amounts of water can cause chemical reactions that could lead to dangerous fumes.

Provide Plenty of Ventilation

Choose a location with ample ventilation for storing your chemicals. In areas with little airflow, dangerous fumes can quickly accumulate if chemicals do start to react. Ventilation is even more important when multiple chemicals are stored in close proximity to each other, as certain chemicals may create a hazardous reaction when combined.

Be Attentive to How You Store Different Chemicals

Refrain from stacking different chemicals on top of each other as this is not advised. Storing chemicals requires careful attention to the product label instructions for each individual product. Material Data Safety Sheets (MSDS) are provided with each chemical product upon purchase and should be referenced with care. Keep in mind to never store oxidizers and acids close to each other.

Take care to never store any chemicals on the floor or above your head. This reduces the risk of items falling or spilling. In addition, avoid stacking liquid chemicals above powdered ones due to the risk of a hazardous reaction.

Keep Chemicals Away From Flammable Items

Outdoor storage areas for your hot tub chemicals should be situated away from anything flammable. Keep any petrol-powered equipment, like your lawnmower, in a different location. The storage area should also be away from sources of heat, like an outdoor fire pit or BBQ.

Do Not Reuse or Switch Container

Reusing chemical containers or transferring chemicals to another container is never recommended as it can be hazardous. When storing your chemicals, always use the original containers with their labels clearly legible. Each container was designed for the specific storage requirements of the chemical it contains.

Even if you’re handling the same type of chemical, mixing a new batch of a chemical with a leftover batch of the same chemical can lead to a reaction from the older residue, or create fumes.

Lay-Z-Spa Chemical Handling & Storage
inflatble Hot Tub Chemicals What Are They and What Do They Do?

Chemicals & What They Do

Explore this list of 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 ACCESSORYFORMFUNCTION
Clearwater Chlorine GranulesGranulesClearwater Chlorine Granules are one of our most popular products and are 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 StripsStripClearwater 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 TabletsTabletClearwater 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.
5-inch Chemical FloaterChemical Tablet DispenserThe 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. Compatible with all spa models.
Clearwater pH PlusGranulesClearwater 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 MinusGranulesClearwater 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 ClarifierLiquidClearwater 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 AlgaecideLiquidClearwater 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 RemoverLiquidClearwater 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 RemoverLiquidClearwater Scale and Stain Remover is great for hard water areas.
Chem connectChemical tablet dispenserThe chem connect attaches to the top debris screen on the liner of the spa. It slowly releases clearwater tablets. The dispenser has an adjustable dial which can control the release. Please remove the chem connect when the spa is being used. Compatible with spas made in 2019 onwards.
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