Are Hot Tub Water Test Strips Accurate?

Are Hot Tub Water Test Strips Accurate?

Are Hot Tub Water Test Strips Accurate?

Water test strips are a type of diagnostic test used in the laboratory to determine when a solution is entirely free of an undesired substance.

When performing a water test, the process begins with adding sample solutions for testing into individual reagent wells.

You can do this with drops or small volumes of liquid, or some reagents can be added in a specific order or amount to create solutions commonly used in water analysis.

Yes! Hot tub water test strips boast accuracy when you use them accurately. There are two types of tests: The deep-water and contrast tests. The contrast test is when you allow a small amount of your body’s weight in weight-based water to remain on a sample after diluting it.

The deep-water test corresponds with many milliliters of your body’s weight in gallons of water present in the sample.

The two tests conclude the same way, but one is based on the weight of your body in gallons, and the other is based on the weight of your body in pounds.

Not having a hot tub water test kit handy is plausible, but you can still do this test on your own, nonetheless. There are three main steps to conducting your water test:

  • Fill a bucket or glass with tap water to a specific line.
  • Add some of your body’s weight in gallons into the bucket or glass filled with tap water.
  • Take a sample of the contaminated water and compare it to the color chart with your hot tub test kit.

The color chart with a hot tub water test kit is accurate when performing the two tests listed above, but there is more to consider. While using a hot tub test strip, you must not dunk your hair or clothing into the water.

This will prevent proper testing and mixing of the colors. Also, be sure not to get the sample too damp. Do not let your clothes or hair into the water while testing.

The water must be able to remain on the test strip for a few seconds before you take a sample.

Do Spa Test Strips Work?

Yes, Test strips are not the actual Spa monitor but are a tool that helps you monitor your water quality. When the color changes on the test strip, change your filter cartridge and refill your Spa with fresh water.

Below is how the Spa test strips work.

First, place the strip in water with your hand and wait a few seconds. The color change should be easy to see, so look at where the color is changing.

If it’s changing immediately, you know your filter is doing its job and that you should refill it with fresh water.

Yellows indicate bacteria and are safe for humans but harmful to your Spa equipment. Your filter cartridge needs to be changed when a large amount of yellow is in the water.

Once the test strips show your filter cartridge has been at max capacity, you should consider changing it to help control bacteria growth.

The test strips are not a replacement for a natural Spa filter but a tool to assist in keeping your Spa clean and healthy.

You should look at other factors when changing your filter cartridge. It would be best to track how long your filter cartridge has been in use, how many visitors have used your Spa, and how often you’ve changed the water.

Is There A Difference Between Pool And Spa Test Strips?

Yes, There is a difference between pool and Spa test strips, and it’s a big one. Pool test strips will detect if the water is too high or low for pH levels, Chlorine, Free Chlorine, or Bromine.

Spa test strips can detect which type of minerals are present in the water, such as bromides, sulfates, or chlorides. Learning the differences can make your pool-care routine easier.

Customers may think that pool and Spa test strips are interchangeable, but there is a big difference between the two.

Pool test strips will help you determine if your water is high or low in particular elements such as PH, Free Chlorine, and Bromine. Spa test strips will tell you your spa’s Bromine, sulfate, or chloride content.

Both types of test strips come in packages of 100 each, and they’re incredibly inexpensive.

You can use the information from your test strips with various treatment products in the Swim Shop. You’ll be able to determine how much product you need, depending on the results.

However, pool and Spa test strips are not interchangeable; The test strips for pools will only measure high or low levels of pH, Free Chlorine, and Bromine. Spa test strips will measure the water’s Bromine, sulfate, or chloride levels.

How Do You Use Spa Test Strips?

You can use Spa test strips to test the pH levels of bath and shower water.

Here’s how it works:

  1. Collect a bath or shower water sample in a container, such as a cup, bowl, or glass.
  2. Drop one test strip into the water for 3-5 seconds to activate it, then remove it from the container and place it on an absorbent surface so that half of its length protrudes above the surface.
  3. Wait for about 15 seconds for the strip to develop color. Then, compare the strip’s color with that shown in the chart on the container. This will indicate whether or not your water is acidic (pH less than 7) or alkaline (pH greater than 7).
  4. After use, discard the strips in a trash Can outside your home. Do not flush them down the toilet.
  5. Never use these strips to test drinking water’s or pool water’s pH, as these may be contaminated with chemicals and heavy metals.
  6. Always store test strips at room temperature, out of direct sunlight, and away from any heat source. This will ensure accurate results and help the strips last for a more extended period.
  7. You can also use Spa test strips to test the pH level of cosmetics and skin care products. For example, you may want to test the pH level of your facial cleanser if you have sensitive skin. If a lotion is too acidic, it may cause itching or irritation.
  8. Store all cosmetics and skin care products separately from your bath or shower water to avoid contamination with other chemicals or heavy metals.

Which is the most Accurate- Test Strips Or Drops?

Test strips sometimes boast more accuracy than drops, owing to the small amount of water they test. However, drops are much more accurate because they can be precisely controlled.

Test strips change color based on the presence of a chemical, while drops change color when a certain level is reached.

Are Hot Tub Water Test Strips Accurate?

For hot tubs, it’s not an issue either way because there’s no way to accurately measure how much you need for your hot tub’s water to reach a certain therapeutic level without doing some calculations and math on your own.

Test strips are designed to read levels of chemicals, which is why they respond differently depending on the chemical. I don’t need my water to be therapeutic, and drops will do just fine.

All I need is for my water to flow from the tap and into hot tubs without having an adverse effect on the water quality itself.

To set up a drop, you’ll want to use a clean glove or dry hand and place it over your hot tub.

You’ll want to repeat that process for about 30 minutes, where you can test the water level in the tub to determine how much drop solution you will need per tub.

Depending on your hot tub’s size, weight, and material construction, you may need more than one bottle of drops.

I like test strips a lot better for a quick and easy way to check the water levels, but they’re less accurate in getting what I want.

Are Bromine Test Strips The Same As Chlorine Test Strips?

The data on bromine test tubes is colorless and not dark yellow or green like Chlorine’s data. Bromine’s colorless result indicates it has a low pH of 6, while Chlorine has a high pH of 14.

Also, when using bromine test strips, you must use a test tube and vial, which requires special handling. The bromine chemical reaction is not as stable as that of Chlorine. You must test the chemicals after mixing them in the tube or vial.

Chlorine test tubes are popular because they are easy to use; drop in the reagents and read the results. However, they tend to cause some severe allergic reactions.

Some laboratories prefer bromine test tubes because they are less expensive and easier to use.

When deciding if you should use bromine or chlorine test tubes, you must decide if your project needs to be more economical or if you need reliable results.

Bromine is the third lightest halogen and the second most reactive element in group 17, behind fluorine. It boasts a fuming red-brown liquid that slowly polymerizes in the air at room temperature.

Bromine is a highly reactive element with many applications, including use in fire retardants, fumigation and pharmaceuticals. It’s a component of halogen lamps and is used in organ bromine compounds.

Its use in organ bromine compounds makes Bromine an essential part of the chemical industry.

Do Chlorine Test Strips Work?

Yes, Chlorine strips are used to detect the level of Chlorine in swimming pools and hot tubs. Chlorine strips typically change colors in the presence of Chlorine, and this color change is then compared to a chart or color wheel on the package.

The higher the concentration of Chlorine, the farther up on the strip that it will turn a particular color.

If you are looking for strips for your pool, purchase tests for various concentrations. This ensures that you are getting the most accurate results. Also want to ensure that any test strips you purchase are guaranteed to work.

Not all swimming pool test strips are created equal, so if you want to ensure that your pool is (safely) clean, stick with a trusted brand name.

There are many different brands of pool test strips on the market, so you will want to ensure that you purchase a valid test.

This means you will want to purchase either a test explicitly made for the swimming pool or one designed to help monitor the health of drinking water.

Some consumers are concerned about the validity of chlorine test strips. The truth is that most swimming pool test strips for Chlorine are incredibly accurate. This means that you should be able to enjoy a safe and clean pool all season long.

Does Bromine Show Up On Test Strips?

The liquid on the strips changes color to indicate whether there’s too much Bromine, Chlorine, or another chemical in your water. This alerts you of a possible problem before it gets out of hand.

For example, too much Bromine makes the water smell like bad breath.

Here’s a rundown on how strips pick Bromine

Polarized test strips only measure Chlorine and Bromine. You need to use a different test strip to know how much Bromine is in your water. Color-changing test strips can do everything – including detecting Bromine and Chlorine and pH levels.

When searching for a test strip, select one that’s color-changing. In addition, look for a halo effect around the color change indicator. That means a reputable company designed it, so it should be safe to use.

Otherwise, Bromine is added to swimming pool water because it helps keep the water clear or removes stains. Bromine can also help keep your pool or hot tub equipment running smoothly.

There are safety concerns when using Bromine in a pool or hot tub, though. Very high levels of bromine exposure can cause burns and cancer.

So, it’s essential to have a way of testing the water to make sure that the bromine levels are safe. If you use colored-change test strips, you know that you’ll be able to see whether or not the bromine levels are getting too high.

How To Use Hot Tub Test Strips

Hot tubs can be a fantastic resource for your health and well-being, especially in the wintertime. With this in mind, it’s crucial to keep your hot tub clean so that you can reap all the benefits of using it.

There are many options for cleaning a hot tub, but one of the most popular is using test strips.

Step 1: Gather Your Supplies

To properly use test strips in your hot tub, you will need the following supplies:

  • A bottle of chlorine tablets
  • Test strips
  • A bucket (for rinsing water)

Step 2: Fill the Hot Tub With Water and Chlorine Tablets

  • You should fill your Hot tubs to at least one inch over the manufacturer’s recommended capacity.
  • Add chlorine tablets. If your hot tub doesn’t contain chlorine tablets, you can easily purchase them in bulk and add them yourself.

Step 3: Test Your Water

Before using your hot tub, test it for chlorine levels. You can easily do this by pouring a few drops of bleach into your water and seeing if it changes any color. If so, your water has too much Chlorine. If not, you can move on to the next step.

Step 4: Test Your Water

  • If you use hot tub test strips instead of bleach, throw a test strip in your water and wait 30 seconds.
  • The color on the test strip will change to indicate how much Chlorine is in your water. If the strip is a dark green, the level is too low. An amber or yellow strip means there is enough Chlorine.
  • Add more chlorine tablets to your hot tub if the strip is dark green. If the strip was amber or yellow, there was enough Chlorine in the water.
  • Repeat steps 1 through 4 weekly for best results.

Ideal Ranges For Test Strip Measurements

If you’re taking test strips to measure your hot tub’s pH, Chlorine and water balance, it’s essential to know what ranges are ideal for each.

To measure the pH (potential of hydrogen), I recommend using a test strip from 0-14. Once you enter your model and water specifications, the logger will show which ranges are ideal for your particular hot tub.

To use the same tool to determine the ideal chlorine range for your hot tub, you’ll need to provide the water temperature and DH/DT (difference in temperature from inlet water or pump to outlet water).

For example, if you have a hot tub around 104-105 degrees F and the DH/it around 8 degrees F, your ideal chlorine range would be between 0.0 and 4.0 ppm.

Also, do a minimum shocking of every seven days using Chlorine. If you have any residue, such as algae, I suggest using a combination of shock and oxidizer, such as Ozone.

To determine the ideal water balance for your hot tub, enter the temperature range (not less than 40 degrees F) and the calcium hardness levels and Total Alkalinity levels.

The logger will show you if your pH is low (below 7.2), high (above 7.4) or perfect for your particular hot tub.

If you have calcium hardness levels above 140 ppm and need to add alkalinity, use the Ideal Alkalinity Ranges tool to determine the exact amount of alkalinity needed.

If you have low calcium hardness levels below 100 ppm, I suggest using a calcium hardness booster first. If you still need to raise the alkalinity and have low Chlorine, I suggest using sodium bicarbonate.

Tips To Get The Best Reading From A Test Strip

To read a Spa test strip, just hold it to the color chart on its bottle and match it to the right colors. One color will have a dip for holding your finger over, while others will have a single flat side.

If they give instructions, you should follow them to the letter. When they ask you what color it is, say “yellow” or “green” (depending on the strip) to get a more accurate reading. If you can’t read it, call the company for help.

Once you’ve followed the instructions on the bottle of test strips, you’re guaranteed to get an accurate reading.

If you leave your hot tub off for more than a week, then turn it back on or clear it before testing again, there is a chance that your readings will be wrong.

You may skip a day or two between treatments but don’t want to leave your hot tub off for an extended period.

Using the right amount of chemicals at the right time will help prevent your water from becoming cloudy or having a funky smell.

Are Hot Tub Water Test Strips Accurate?

If you have questions about what chemicals to use, call the company that provides your test strips. They can help you decide what chemicals are needed and how much to use.

How To Store Hot Tub Test Strips

Below is how you can easily store hot tub test strips.

  1. Keep the test strip container in a safe location, such as a drawer or cabinet. If there is no closable place, use a safe container or zip-lock bag to keep the strips from touching each other.
  2. Avoid storing near any chemicals that would dissolve them (such as bleach).
  3. Temperature: Keep the strips in a cool, dry place. Do not store at temperatures above 60 degrees F (average room temperature). Avoid direct sunlight or heat sources to prevent the strips from melting.
  4. Light: Be sure to store the strips in a place that does not receive direct sunlight.
  5. Moisture: When stored, the strips should have no water. If they become damp or damp condensation forms on the strips, it can cause the strips to clump together and write the wrong results. Keep water out of test strips.

This is a test strip that you could use in your hot tub. The container is small, so you could keep it in your hot tub or locker. This is a very easy way to store the test strip. You could easily store all the test strips you need for the week.

Do Hot Tub Test Strips Expire

Yes, Hot tub test tubes do expire.The chemical reagents that test for pH, Chlorine, total alkalinity and calcium hardness have a shelf-life. The time these tests can be used varies by pool conditions and size.

Generally, you will get more accurate results with fresh test strips.

First, get your hands on a new batch of test strips (which should be done every few months). You can also purchase Test tubes if you have just a few pools.

The new test strips are used monthly or less, depending on the water quality. Make sure that whatever store you buy from does not mix up the old and new chemistries for you when you reorder your strips.

Then order a fresh supply of all three tests (pH, Chlorine and Total Alkalinity) and calcium hardness.

You will want to do them more often if you have a larger pool. Some prefer to do them once weekly though this requires a lot of staff time. How often depends on the pool size and how picky you are about how clean it is.

Remember that each type of test has its chemical reagent, and each one expires at a different time based on the chemistry used in the test strips or collection tube.

The good news is that you can use expired test strips if the chemicals they use have not deteriorated. The bad news is that the accuracy goes down. That is why it is best to keep new chemicals on hand.

Can You Use Chlorine Test Strips To Test For Bromine

Yes, You can use Chlorine test strips to test for Bromine, except for those tests specifically designed to detect only Chlorine, chloramine and combined Chlorine.

This is because Bromine is a Halogen, just like Chlorine, so it will react similarly with the type of chemical sensor typically used in these tests.

You should be aware of some additional considerations if you want your testing results to be accurate and reliable. Chlorine is a very reactive substance, and it’s highly corrosive. It will react with any metal, even Stainless Steel.

However, you should not use your test strips to test Bromine if they have been exposed to the chemicals in your pool or Spa for an extended period or have been contaminated by other substances in the pool or Spa.

The most common method of Bromine testing is called the Direct Inhibition Method. This method is inaccurate, and you should only use it to test a water sample exposed to Bromine.

A much more accurate, fast and effective way to test for Bromine is through an Autoabrator.

Suppose you do not want to invest in a fully insured Autoabrator or want to try your hand at testing for Bromine without going through such an expensive process.

In that case, I recommend purchasing a Hydrostatic Test Kit from pool feed dealers, online discount retailers and online auction sites.

Salt Water Test Strips

Saltwater hot tub water test strips are a low-cost, reliable and easy way to test the quality of your water. By adding these strips to a glass of hot water, you can tell if there is salt balance in the tub.

These strips are made from non-toxic, dissolvable materials that don’t require mounting or adhesives. They are packaged in a sealed tube so you can use the water immediately.

They work by directly reacting to water with a short chemical coat that becomes bluish upon reaction. The more salt the water contains, the larger the blue dots appear on the strip’s surface.

Saltwater test strips also boast some features:

  • Non-toxic
  • Dissolvable material
  • Reacts to water
  • Low-cost test strips
  • Easy to read dots that correspond with various salt levels
  • Non-hazardous and non-corrosive.

The saltwater test strip comes in a  non-hazardous, non-corrosive (dissolvable) paper tube; the tub dissolves in hot water to release strips ready for use.

When using it, add a few inches of hot water and shake well immediately after opening the package. Add more water as needed and wait five seconds and read the strip.

Regarding storage, you should keep the salt water test strips in a cool, dry place away from sunlight.

How You Balance Hot Tub’s pH And Alkalinity

The goal of balancing your hot tub water is to get all the chemicals and minerals in the water into their respective target ranges so that your hot tub functions at its optimum level.

Keeping the pH level between 7.2 – 7.8 is ideal because of the reason we just discussed.

This process takes a few weeks to get everything to its optimal range because you will slowly add chemicals to the water in small doses so that you don’t shock the system or cause an imbalance.

It’s something that will improve day by day with diligent attention and patience.

After a few days, check your pH levels and stay within your target range. If you’re out of range, add more chemicals.

Most hot tubs will require you to use at least three chemical additives to achieve the alkalinity and pH levels specified by your hot tub manufacturer. These additives are referred to as CACs (Chemical Agent Containers).

Once you have added the CACs within your target range, you can add the pH Up and pH Down chemical supplements. Keep these on hand because you can use them anytime between checks on pH and alkalinity levels.

Once your pH and alkalinity are in their optimum areas, rinse all chemicals out of the hot tub with a few gallons of distilled water.

This will flush the chemicals out, and you will be ready to add them again once your next PH and alkalinity check.

Once the hot tub is thoroughly rinsed, it’s time to balance again.


Hot tub test strips are a cheap and easy way to test several things in your tub. They are inexpensive and easy to use, so if you want to keep your hot tub clean and healthy, you should consider using them.


Hi! I' am Tom. I was a manager in one of the biggest stores for over 10 Years, am also an SEO by night. I don't like to call myself a blogger; they are very analytical, do email marketing, and know all SEO stuff. I faced many questions from customers about different products, and there was hardly any help on the internet. After learning all the things about these products as a manager the hard way, I decided to start a blog and help other people.

Recent Posts