How To Keep Spa Water Clean? Shocking Secrets Revealed!

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Keeping your spa water clean is essential for enjoying a relaxing and healthy soak. Nobody wants to sink into murky or smelly water loaded with bacteria, mold, and other contaminants. But with so many products claiming to maintain crystal-clear spa water, it can be challenging to know where to begin.

In this blog post, we will reveal shocking secrets on how to keep your spa water clean. From testing the chemical levels regularly to using natural remedies, we have got you covered. So, sit back, grab a cup of tea, and let’s dive in!

If you own a spa, you need to stay on top of maintaining its water quality. Even if you are not an expert, basic maintenance routines can prevent problems from occurring. For starters, you should test your spa water daily using a simple kit that measures pH levels, total alkalinity, and sanitizer (e.g., chlorine or bromine) concentration. Maintaining proper chemical balance helps to kill germs and prevent algae growth efficiently.

You may also want to shock your spa periodically to remove harmful organic materials and built-up contaminants that make your spa water look cloudy or greenish. Shocking involves adding a high dose of chlorine or non-chlorine oxidizer to sanitize the water, break down oils and lotions, and reduce unpleasant odors. Remember to read the instructions carefully before using any shock product as some require specific pre-application conditions.

So, now that we have discussed the basics, let us explore more about keeping your spa water clean in-depth.

Regular Maintenance

Nothing beats the feeling of submerging into a clean and refreshing spa, but achieving this requires more than just adding chemicals to your water. Regular maintenance is key to keeping your spa water crystal clear and safe for use. Here are some tips on how to keep spa water clean:

Clean Filters

Your spa’s filters collect dirt, debris, oils, and other contaminants that accumulate over time. These particles reduce the efficiency of your filter system, leading to cloudy water and, ultimately, poor performance. Cleaning your filters every 4-6 weeks is crucial in preventing various issues.

Start by turning off the power supply and opening the compartment housing the cartridges. Remove the cartridge(s) and rinse them with high-pressure hose or showerhead, applying enough pressure to remove all grime and dirt stuck inside the pleats. Once it’s done soak them in cleaning solution from drain pipe overnight then rinse them with fresh water before you insert back the filter into its original place. Always replace old filters with new ones at least once a year.

The frequency of the cleaning process can vary based on usage and number of users. Check the user manual of your hot tub for guidance specific to your model.

Monitor pH levels

Proper pH balance of spa water is essential to ensure optimal cleanliness and comfort. A balanced pH condition prevents mineral deposits buildup, skin irritation, cloudy water, algae growth, and equipment damage. The ideal range of pH level should be between 7.2 – 7.8.To monitor the pH regularly you can buy small test strips readily available in local shops.

You could enhance the alkalinity & pH of the water using sodium bicarbonate or chlorine acid or you can lower the pH level using Spa down formulas which contain sodium bisulfate or muriactic acid. Follow the dosage recommended by your spa manual and always add chemicals with proper safety measures.

Keeping these steps in mind can help put you on the right track to achieve brilliant clarity, sanitation, and complete balance in your spa water.

‘Regular maintenance keeps your hot tub sparkling clean and extends its lifespan.’

Use Sanitizers

In order to keep your spa water clean, you must use sanitizers. Sanitizers help kill bacteria and viruses that could potentially harm your health when you’re using the spa.


One of the most commonly used sanitizers for spas is chlorine. Chlorine helps to kill germs and algae in the water and keeps it crystal clear. It also has a residual effect which means it stays in the water over time and continues killing any new contaminants that enter the water.

However, you need to be careful with how much chlorine you add to your spa. If you add too much, it can cause skin irritation and breathing problems. A good range to maintain is between 1-3 parts per million (ppm).

“When it comes to chlorine, less is usually better than more.” –

If you’re concerned about the harsh effects of chlorine, consider using a non-chlorine shock treatment instead. These treatments use active ingredients like potassium peroxymonosulfate to oxidize and remove organic matter from the water without the strong chemical smell or bleaching side effects of traditional chlorine.


Another option for sanitizing your spa is bromine. Bromine is less irritating to the skin and eyes than chlorine but still provides effective sanitation for your spa water. It’s particularly useful for people with sensitive skin or allergies.

Bromine tablets dissolve slowly in the water, providing a consistent level of protection against bacteria, viruses, and algae. One downside is that they don’t have the same residual effect as chlorine so you’ll need to add them directly to the spa water several times a week to maintain adequate levels.

“Bromine tends to be better than chlorine for those that have sensitive skin or allergies.” –

Ultimately, whether you use chlorine or bromine it’s important to test the water regularly and maintain proper sanitizer levels to keep your spa water clean and safe.

Drain and Refill Spa

One of the most important things you can do to keep your spa water clean is to drain and refill it regularly. Over time, your spa water can become contaminated with bacteria, oils, and other organic materials, leading to cloudy or smelly water that’s no longer safe or pleasant to use.

So how often should you drain and refill your spa? The general rule of thumb is every three to four months, or more often if you use your spa frequently or have a larger group of people using it. However, there are some signs that you may need to drain and refill your spa sooner, such as:

  • Foamy or bubbly water
  • Clogged filters or reduced circulation
  • pH or chemical imbalances (as indicated by testing strips)

If any of these symptoms occur, don’t hesitate to drain and refill your spa right away to prevent further problems.

When Necessary

“Keeping your hot tub well maintained not only extends its life span but ensures hygiene & cleanliness too”. – Jacuzzi Direct

“It’s best to avoid draining your entire spa in winter, this will expedite cracks on your pipes and shell. Don’t let frozen hoses create an ice dam in them either.”
“Another point to bear in mind while refilling your spa is to ensure the mineral levels in your purified system aren’t precariously concentrated. This can be done simply by managing what products you choose. Chlorine isn’t always best!”

While regular maintenance is crucial for keeping your spa water clean, it’s also essential to monitor your water quality and address any issues promptly when necessary. By following these simple tips, you can enjoy clean, clear, and healthy spa water all year round.

Consider Alternative Water Treatment

Keeping spa water clean is essential for enjoyment and safety. Traditional chlorine treatments can be harsh on the skin and eyes, not to mention the environment. However, there are alternative methods available that can provide a more natural and effective way to keep your spa clean and safe.

Salt Water Systems

A salt water system uses a process called electrolysis to convert salt into chlorine, which is then dispersed into the spa water. This type of treatment provides a more gentle and natural approach to sanitizing the water compared to traditional chlorines.

In fact, “Saltwater systems are becoming increasingly popular because they create softer-feeling water with less odor and skin irritation than any other kind of spa-water purification system,” according to an article in Outdoor Living magazine.

Although initially expensive, salt water systems can ultimately save money in the long run as they require less maintenance and chemicals over time.


An ozonator is another option for keeping your spa water clean. It uses ultraviolet light or corona discharge to produce ozone, which acts as a powerful disinfectant to kill bacteria, viruses, and pathogens in the water without the use of harsh chemicals.

This method has been found to be highly effective in killing bacteria and fungi, making it a great choice for those looking for a chemical-free solution. According to Davey/Crystal Clear, “Ozone works 2500 times faster than Bromine, kills all known viruses (including Legionnaires’ Disease), and leaves no harmful by-products.”

However, it’s important to note that while ozone is effective at killing pathogens, it does not eradicate organic matter such as dead skin cells and oils from body lotions, which must still be filtered out using traditional methods.

“Saltwater systems are becoming increasingly popular because they create softer-feeling water with less odor and skin irritation than any other kind of spa-water purification system.” -Outdoor Living magazine

Frequently Asked Questions

What chemicals should be used to keep spa water clean?

Chlorine and bromine are the most commonly used chemicals to sanitize spa water. Chlorine is effective at killing bacteria and viruses, while bromine is more stable in high temperatures and less likely to produce a strong odor. Other chemicals such as pH increaser, pH reducer, and alkalinity increaser are also important for maintaining proper water chemistry.

How often should spa water be tested and balanced?

Spa water should be tested and balanced at least once a week. The pH level should be between 7.2 and 7.8, and the total alkalinity should be between 80 and 120 ppm. The sanitizer level should be maintained at the recommended level for the specific chemical being used. It is also important to shock the spa after heavy usage or if the water appears cloudy.

What steps should be taken to prevent algae growth in a spa?

To prevent algae growth, it is important to maintain proper water chemistry and sanitizer levels. Regularly brushing the spa walls and floor can also help prevent algae buildup. It is also recommended to use an algaecide as a preventative measure.

How can I minimize the amount of dirt and debris in my spa?

Using a spa cover when the spa is not in use can help keep dirt and debris out. It is also recommended to shower before entering the spa to remove any oils or dirt on the skin. Installing a pre-filter on the spa’s water intake can also help prevent debris from entering the spa.

What are some common mistakes to avoid when maintaining spa water?

One common mistake is adding too much sanitizer, which can cause skin irritation and damage to the spa’s equipment. Another mistake is not testing and balancing the water chemistry regularly, which can lead to cloudy water and bacteria growth. It is also important to avoid using household cleaning products in the spa, as they can damage the spa’s surface and equipment.

Is it necessary to drain and refill the spa water periodically?

Yes, it is recommended to drain and refill the spa water every 3-4 months, depending on usage and water quality. This helps prevent buildup of minerals and other contaminants in the water. It is also a good opportunity to clean the spa’s surfaces and equipment.

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