The main rule to keep in mind is that it takes 25.6 oz. Of full-strength muriatic acid (31.45 percent hydrochloric acid) to lower the total alkalinity by 10 ppm in 10,000 gallons. The problem: If one adds enough acid to lower the total alkalinity all at once, the pH can get very low. Jul 08, 2019 If you were in a hurry, you could pour muriatic acid straight into your pool water, but diluting it first makes it easier to handle and less dangerous to you if it splashes. It’s worth a few extra minutes and a bucket to water it down. The ideal ratio of water to muriatic acid is 10:1. How to Lower Alkalinity in a Hot Tub The two most popular chemicals available to help you lower the Total Alkalinity in your hot tub are muriatic acid and sodium bisulfate (also known as dry acid). After you’ve added muriatic acid, dry acid or another alkalinity decreaser product, be sure to check the pH level in the hot tub, as the pH level.
Hot tubs can be a great investment, hence the need for proper hot tub water care. Otherwise, you will experience unbalanced alkaline levels that cause the water to be cloudy and create environments for bacterial growth.
This article will help you understand hot tub alkalinity and how to keep your hot tub’s water balanced.
What is Total Alkalinity?
Contents
The first thing you want to do when balancing your hot tub water is balancing its total alkalinity first. Total alkalinity, often called a buffer, helps in balancing the pH levels. Hence, you should aim to balance the total alkalinity before you start looking at the pH levels or add any chemicals into the hot tub.
When the alkaline levels in your hot tub are unbalanced, it can have a cascade of effects on your tub’s appearance. You will also be prone to the skin to skin infection and damage.
A low total alkalinity can cause a rapid change in the pH and can be damaging to your hot tub. It can corrode metal parts and leave stains on the surface. When the pH level drops, the hot tub water becomes more acidic, resulting in burning eyes and itchy dry skin.
Another problem can result when the hot tub alkalinity is too high. High alkalinity level of the water will also cause the pH level in the hot tub to soar high, which can be difficult to lower. Such an environment can raise the calcium levels in the water, making it cloudy.
This can also result to formation of a hard, crusty mineral build-up (scale). Additionally, high alkaline water can result in green water. This is because it minimizes the effects of chlorine that help to keep algae under control.
How to Lower Alkalinity in Hot Tub
Wondering how to lower alkalinity in hot tub and stabilize the pH? Basically, the correct total alkalinity should range between 80 and 120 parts per million (ppm). A spa volume calculator can help you calculate the right range for your hot tub.
You, therefore, do not want anything above this range; otherwise, you will experience scale formation, skin and eye irritation, cloudy water, and hard to change pH.
In order to lower high alkalinity, you need to add a pH decreaser. Some of the known pH decreaser products include sodium bisulfate (dry acid) and muriatic acid. Note it is important to turn off the jets and the pump when adding the acid in order to lower alkalinity. And when you add a dry acid, place it in the middle of the tub such that the water is not circulating.
This will bring both the total alkalinity and pH levels down. We highly recommend that you retest the water after adding the pH decreaser to check if it has returned to its normal range.
How To Raise Low Alkalinity in Hot Tub
As seen above, too low alkalinity can lead to rapid changes in pH, as well as skin and eye irritation. It also causes the water to be corrosive, which affects the metal fittings in your hot tub, and this can result in discoloration of the water.
You should, therefore, aim to keep the total alkalinity readings above 80 PPM. How to increase alkalinity in hot tub? You can either use sodium bicarbonate (baking soda) or alkalinity increaser. We recommend using an alkalinity increaser that contains sodium bicarbonate which helps to raise the pH. Let the hot tub sit for 6 hours before you retest.
Conclusion
It is crucial to maintain a balanced water in your hot tub. This will keep you from problems such as water corrosion, burning eyes, itchy skin, and other serious issues. A sure way to maintain balanced water is to do frequent testing using a water test kit and then make the necessary adjustments. You can also take the water sample to a test station for results of your hot tub alkalinity level.
This way, you will enjoy your hot tub with peace of mind.
How To Raise pH in Hot Tub
Like any other major purchase, if you have decided to invest in a hot tub you will want to know how to properly maintain it in order to extend its lifespan. You’ll need to keep the water balanced to gain benefit from owning your own hot tub so your and friends can use it safely.
There is a short list of chemicals that you will need to keep on hand to keep the water maintained and the pH and alkalinity levels balanced.
The chemicals used to balance pH and alkalinity are inexpensive but are extremely important. Water pH is a measurement of the acidity of your water.
Just to give you an idea why this is, our skin acidity is 7.35 to 7.45, so this lies in the middle of the suggested water acidity range – that way we are more comfortable in our spa and at this range bugs are kept under control more easily.
If your pH fluctuates outside that safe zone, the water becomes unsafe and can cause corrosion, mineral scaling, or you can face unhealthy bacterial growth.
Alkalinity is a measure of the water’s ability to buffer the pH to neutralize the acid.
It may seem complicated at first, but with a little practice it becomes routine.
It helps keep pH levels stable so when your water dips out of range, you can simply adjust your TA (Total Alkalinity) without having to completely redo your hot tub chemistry.
Alkalinity should be between 125ppm and 150ppm and be adjusted first since it keeps your pH in check, so when it slips levels, your pH will as well.
Failure to maintain alkalinity may result in corrosion, phosphate imbalance which can lead to algae growth and green water, mineral build-up, and cloudy water.
On top of these effects, there’s every chance you will be developing bacteria-rich water by allowing bacteria from either side of neutral to breed to excess.
What causes low pH in hot tub?
Testing kits for pH levels are available at pool supply stores. You dip a strip into the water and read the pH by matching the color it turns to a scale printed on the bottle. The ideal level should be in the neutral range.
The one in the picture shown runs at just over the $10 mark directly from Amazon, so there’s no great cost involved with these tests.
You will also need some test strips to take a sample of your water – again, inexpensive.
An alternative to the test strips is to use a digital meter costing almost double but this one does not need the strips, so will soon pay for itself.
Elevated levels of acid cause sanitizing chemicals to become ineffective allowing harmful contaminants to come in contact with bathers, which can lead to rashes and eczema.
It can also irritate swimmer’s skin and eyes. Too much acid takes its toll on your tub’s components causing them to corrode.
So, what causes low pH in hot tub spas making the water excessively acidic?
In a word, if you’ve set the chemical levels right to start with, it’s YOU – and anyone who joins you in the hot tub.
It is well known we all sweat in hot tubs, and it is these bodily fluids, along with flaky skin, anything that is or was living, rots down and causes acidity. So the more people you have in there and for a longer time without water changes, then your water will grow more and more acidic as time passes.
On top of that pH that’s too low can be caused by the type of water you use.
Soft water will have a completely different pH than hard water. Thus, when you add water, it will alter your level accordingly.
Different chemicals you use will also cause fluctuations since they have different pH ranges too. When the time comes to add more chemicals, the levels will change depending on the amount used and the pH level of that specific chemical.
How to raise pH in hot tub
Low levels can cause skin irritation and degrade the spa’s heater and other components. The pH levels in your hot tub can be increased by using magnesium oxide which has the ability to neutralize carbon dioxide.
The first step is to adjust the alkalinity using either of the test methods above.
The next step you take in how to raise pH in hot tub spas is you gradually add an increaser like SpaGuard pH Increaserto get the right reading.
Then allow the tub to run for 30 minutes to evenly circulate the chemicals.
Last, turn off the jets and conduct a retest to ensure the alkalinity is still at proper levels.
What causes high pH in hot tub?
A high pH level is a level above 7.6 ppm. This means your water is too basic, too alkaline, and when your water pH is too high, it can begin to form scales.
Scales are a white and chalky residue that’s rough to the touch and can be found on the tub’s surfaces.
These scales can block water circulation by becoming lodged in pipes and blocking their flow. As they build, scales will cause early equipment failure.
These scales are formed by the Alkaline effect forming lime which eventually will become like chalk in that it will block your pump and piping if left for too long without balancing the water.
On top of this, you may notice a greeny tinge developing in your water which, if left too longe, will eventually form algae.
You will need to regularly use a pH reducer and we recommend Leisure Time Spa Reducer.
Reducers usually consist of dry acid crystals such as sodium bisulfate but liquid forms are also readily available.
The pH reducer needs to be added gradually over a period of time depending on the manufacturer’s recommendation. You add it gradually, allow it to circulate, and then retest the pH level. If it is still too high, you repeat the process until it gets in range. Adding too much reducer too quickly can result in making the water too acidic that you will have to get to come back down.
The most common reason for an elevated pH level is a very high alkalinity level. Since alkalinity acts as a buffer to help keep pH in range, when it raises, so will your pH level because it will not be able to keep it under control.
Hot tubs run at a higher temperature and produce bubbles which cause a buildup of carbon dioxide. The carbon dioxide is also notorious for raising both pH and alkalinity. As has been stated, this carbon dioxide is also a result of living matter decomposing.
How much muriatic acid to lower pH in hot tub?
Muriatic acid(also called hydrochloric acid) is another chemical commonly used to lower a spa pH level that is too high. The amount you use will depend on the capacity of your hot tub and how high the pH actually is.
How much muriatic acid to lower pH in hot tub spas? Here is a general amounts guide:
• 400 gal. spa:
o 7.6-7.8: .5 fl oz.
o 7.8-8: .6 fl oz.
o 8-8.4: 1 fl oz.
o Above 8.4: 1.3 fl oz.
• 750 gal. spa:
o 7.6-7.8: .9 fl oz.
o 7.8-8: 1.2 fl oz.
o 8-8.4: 1.9 fl oz.
o Above 8.4: 2.4 fl oz
• 1500 gal. spa:
o 7.6-7.8: 1.9 fl oz.
o 7.8-8: 2.4 fl oz.
o 8-8.4: 3.6 fl oz.
o Above 8.4: 4.8 fl oz
How to lower pH in hot tub home remedy?
Many people have issues where the spa chemicals can irritate their skin or cause health problems. Others may just want a more natural alternative.
That leaves many questioning how to lower pH in hot tub home remedy?
Here are a few alternative methods to lower pH levels without harsh substances.
• Lemon juice or vinegar both contain acids that can bring pH levels down. You will have to use plenty of it because vinegar only contains about 5 percent acid.
• Using peat moss is generally thought of as the most effective natural method of dropping pH. Peat moss can be placed in a mesh bag and placed somewhere the water will flow through it.
• Driftwood acts as a natural filter. It will need to be soaked for a few days prior otherwise it will discolor water.
• Use distilled water
• Install a carbon dioxide system to monitor and adjust pH levels automatically
Another alternative to using chemicals is to use baking soda to reduce the acidity of your water – check out our post on How Much Baking Soda to Raise Alkalinity in Hot Tub
Again – if you are not into chemicals, then I suggest you take a look at our post Running Hot Tub Without Chemicals
Keeping your hot tub water in at a neutral pH level is important both for the longevity of your spa, as well as for the people who use it.
Alkalinity and pH go hand-in-hand and work together to keep your water safe. Without regular chemical maintenance and testing, you will experience issues like bacterial growth, algae, scaling, eye and skin irritation, and corrosion.
So make sure you know how to raise or lower pH in your hot tub for your own benefit and your hot tub’s.
On the other hand, if you are like me, lazee, and want an easier option, how about the pHin Wi-Fi-Enabled Smart Water Care Monitor for Hot Tubs and Pools.
Once set up, just drop it in your pool water and it will let you know as any problems arise and literally tells you, directly to your phone, what needs doing to correct the problems.
Not cheap, but well worth the loss of aggravation.
There are even videos showing how to set it up and how it works here.
We use one ourselves and can highly recommend them.
With 135 positive customer reviews so far. – It’s a Godsend to us!
Why not check out some of our other informative posts:
Adding Muriatic Acid To Pool Water
Related Posts
How Much Muriatic Acid To Add
- Best inflatable hot tub with water jets
Looking for the best inflatable hot tubs with water jets? Most hot tubs are built to a price, meaning the majority of them are supplied with a bubbler system as…
- Health benefits of a hot tub at home
Benefits of an Inflatable Hot Tub at Home First of all, let me tell you why we got our inflatable hot tub. Not so long ago, after a lovely family…
- Hot tub temperature when not in use
Having been asked by some hot tub owners for the best suggested hot tub temperature when not in use, like when they take a break for more than a week…
- Hot Tub Temperature Too High
7 easy ways to keep your hot tub cool in the summer Hot tub too hot in the summer? Alright… Summer’s here and there’s no end to the sweltering heat.…
- Is A Hot Tub Good For A Cold
In a word – YES, and there are four reasons why. Having An Elevated Temperature Helps To Fight Viruses When we catch a cold our bodies develop a higher temperature…
- Inflatable Hot Tub Running Costs
The cost of running an inflatable hot tub was one of our first fears before we jumped in and purchased our one and only hot tub So how much does…