Both the pH and alkalinity will be lowered by adding either muriatic acid, hydrochloric acid, or pH Decreaser (sodium bisulfate).
How to Use Muriatic Acidto Lower Pool pH
This chemical, which is a strong acid, is a very efficient way to lower your pool’s pH and total alkalinity. The surface of the pool can also be cleaned using muriatic acid, but exercise caution—this chemical is extremely potent.
Uses for Muriatic Acid:
1. Measure the alkalinity and pH of your pool (liquid test kits are the best way to do this).
2. Calculate the necessary acid and 10:1 diluted it in a big pail of water. By doing so, any splashback from pouring it into the pool will be avoided.
3. Fill the deep end of the pool closest to the jets with the solution. Ensure that the water is being circulated by the pump.
4. To decide whether extra acid is needed, wait at least 5 hours, preferably overnight, before retesting the alkalinity and pH of your pool. Whenever required, repeat steps 2-4.
5. Recheck the pH when you reach normal alkalinity (80–120 ppm). To restore pH to ideal levels if it falls too low, you can simply aerate the pool or apply a pH increaser.
**Acid should only be used with the utmost care as it might burn your skin. If it splashes on decks or the pool surrounds, it will also discolor them.
How much Muriatic Acid to Lower Pool pH?
The water volume, pH, and alkalinity levels in your pool will determine how much muriatic acid is required to lower the pH. Keep in mind that lowering alkalinity will cause the pH to increase.
To lower alkalinity by 10 ppm, you’ll need about 35–60 fl oz of muriatic acid per 10,000 gal of water. Calculate the estimated amount of muriatic acid required to lower pH and alkalinity using the appropriate chart below.
The best way to add acid is in modest batches, then test it again and add more if necessary. Otherwise, the pH levels could swing back and forth.
How to Lower Pool pH with Hydrochloric Acid
In the swimming pool industry, muriatic acid and hydrochloric acid are frequently used interchangeably.
Muriatic acid and hydrochloric acid have a lot of the same chemical properties; the key distinction is that muriatic acid is around 30% more diluted. Because hydrochloric acid is more powerful, fewer impurities are added to it, which increases its cost.
In the end, it performs the same function as muriatic acid. To determine the precise quantity required to change the pH levels in your pool, consult the manufacturer’s instructions.
How to Use Sodium Bisulfate (pH Decreaser)to Lower Pool pH
A dry acid (acid salt) called sodium bisulfate is also used to lower the pH and alkalinity of your pool. It is produced by partly neutralizing sulfuric acid and is available in powder or granular form. Sodium bisulfate is a significantly safer substance to handle than muriatic acid. But its power isn’t as great.
In pool supply stores, sodium bisulfate is marketed as “pH Down,” “pH Decreaser,” and “pH Minus.”
Uses for Sodium Bisulfate
1. As instructed on the packaging, measure the needed amount.
2. Instead of dumping the product directly into your pool, dilute it first (dilution can be achieved in a 5-gallon bucket of water).
3. Place the powder (or mixture) near the jets at the deep end of your pool. To circulate the water, turn on the pump.
4. A minimum of five hours, ideally overnight, should pass before retesting your pool to see whether more has to be added.
5. Check the pH when you reach normal alkalinity (80–120 ppm). To restore pH levels to ideal ranges if they fall too low, you can simply aerate the pool (by splashing) or use a pH increaser.
How Much Sodium Bisulfate to Lower Pool pH?
The approximate quantities of pH Decreaser (sodium bisulfate) you will need to reduce the pH and alkalinity in your pool are listed below.
The figures below are a rough estimate. Always read the manufacturer’s instructions before using anything. In order to prevent exceeding your desired pH level, it is also better to add less than you anticipate.
Natural Ways to Lower Pool pH
A few common household items that are natural could possibly be utilized to reduce the pH in your pool.
Wondering how to lower the pH of your pool using vinegar? In principle, you might lower your pool’s pH by using regular household vinegar. When compared to the pH of your pool water, vinegar has a pH of roughly 2.5, which is a high level of acidity.
However, compared to a powerful acid like muriatic acid, household vinegar is quite weak, thus you would need a significant amount to reduce pH.
Additionally, adding vinegar would result in a reaction that would leave acetates in the pool water, which is not what you want. Adding things to the water in your pool is generally not a good idea.
Lowering pH and alkalinity is much better accomplished with muriatic or hydrochloric acid.
Baking Soda: Baking soda has a pH level of 8.3, which makes it different from the previous two home treatments. If the pH of your pool is higher than 8.3, baking soda will reduce it to a level that is close to 8.3.
When attempting to increase pool pH and alkalinity levels, baking soda is more advantageous. To increase the alkalinity by 10 ppm, you need around 1.5 pounds per 10,000 gallons of water.
Will the Pool pH Lower on its Own?
Unfortunately, the pH will always rise naturally if a swimming pool is left to fight its own struggle. It tends to become more alkaline over time as a result of the gradual spontaneous release of CO2.
This is particularly true for pools with cementitious linings (such pebble, plaster, or quartz), as the water has a tendency to react with the cement over time, raising pH levels.
Have you ever been annoyed by the white, chalky gunk right at the waterline as you gazed out at your sparkling, clear pool? Although calcium buildup doesn’t harm your pool or the water, it also doesn’t look very appealing.
White vinegar may remove this eyesore in your pool, just as you would pour vinegar through your coffee maker to remove calcium buildup. Use a sponge or soft cloth to remove the residue by dipping it in a solution of vinegar and water that has been mixed 50/50. If some of it accidentally gets into the pool water, it won’t harm anything, but if you’re worried, test the water after using vinegar and make any required adjustments.
How can I naturally lower the pH in my pool?
The pH naturally moves upward as the water grows cooler. On the other hand, the pH gradually decreases as the water warms up.
Winter and summer months naturally show this variation, but you can also cause a slight pH change by purposefully boiling your water.
While a heat pump or pool heater can do the task, both require a lot of gas or power to operate. Use a solar pool cover as an alternative if you prefer something more environmentally friendly.
Technical justification: Calcium dissolves less readily in hotter water. When calcium leaves the solution, the water’s LSI increases, forcing a pH decrease to return the LSI to neutral.
Inject CO2 Into the Water
Every pool contains carbon dioxide (CO2), which makes the water feel somewhat like a big can of soda.
The pH of your water will be lower the more carbon dioxide you have dissolved in it since carbon dioxide is acidic.
The problem is that pools lose (off-gas) CO2 through a process called aeration, which is brought on by water features, saltwater generators, or even merely splashing.
Utilizing a special CO2 device to directly feed carbon dioxide back into the water is one technique to counteract this effect. However, this configuration frequently necessitates a constant flow of carbon dioxide into your pool.
Pro tip: By reducing overall alkalinity, you can reduce CO2 off-gassing. Lowering carbonate compounds (which are classified as part of total alkalinity) slows the rate at which over-carbonated water off-gases.
Drain and Refill the Water
Sometimes completely changing the water is the most efficient approach to address a pH issue in a pool without the use of chemicals.
If your water is excessively basic, you can naturally bring it back down by partially draining the pool and filling it again with water that has a lower pH. In extreme circumstances, a full drain and fill may even be required.
Of course, emptying everything isn’t exactly eco-friendly, either, if your goal is to maintain your pool more sustainably.
How can I quickly lower my pool’s pH?
Use pH reducer, a chemical addition designed for use in swimming pools, to lower pH. (or pH minus). Muriatic acid or sodium bisulfate are the primary active components in pH reducers (also called dry acid). Reducers are easily accessible at home improvement stores, pool supply stores, and online.
Muriatic acid has great power.
When putting the chemical to your pool, be careful because it is used to etch concrete. You must safeguard yourself from inadvertent spills and splashes because it is a liquid. For safe handling, application, and storage of muriatic acid, make sure to always read and abide by the manufacturer’s instructions. A gallon bottle costs approximately $45.
Muriatic acid is thought to be more difficult to add and risky to handle than sodium bisulfate, which is available as dry granules. However, it needs to be handled with caution. To prevent breathing in any of the granules’ dust, cover your eyes, skin, and breathe via a dust mask. An average 25-pound bucket costs $50.
How much vinegar is required to reduce pH?
True wonder product: vinegar. It has been a common cleaning ingredient for ages and has health benefits for blood sugar control. Vinegar can help your soil become more acidic in the garden.
You can buy vinegar for a reasonable price at practically any grocery shop. When diluted for soil, it’s also a secure and non-toxic treatment.
Mixing vinegar and water together is the quickest and easiest way to make a vinegar solution for your garden. For every gallon of water, use one cup of vinegar.
Depending on how alkaline your soil is, you may need to adjust the vinegar-to-water ratio. But a good starting point is one cup of vinegar to one gallon of water.
After combining the soil, water it, spreading the mixture as evenly as you can across the allocated area with a watering can.
Will baking soda lower the pH of the pool?
With a pH of 8, baking soda, sometimes referred to as sodium bicarbonate, is inherently alkaline. The stability and clarity of your pool water will improve when you add baking soda, which also increases pH and alkalinity. Baking soda is used as the primary active ingredient in many commercial pool treatments for increasing alkalinity. By utilizing pure baking soda in your pool, you can keep your pool maintained for a fraction of the expense.
Can I use vinegar for muriatic acid?
If you are unable to find muriatic acid (HCl) to utilize for pH regulation in your pools, you do have other options. Although sulfuric acid is a possibility, its supply may encounter problems because of the rise in demand brought on by the lack of HCl. The product may cost a little more than muriatic acid would typically cost, but the dosage will be the same. The Total Alkalinity (TA) will decrease by 10 ppm and the pH by an equivalent amount when 25.5 fluid ounces of muriatic acid (31.45% hydrochloric acid) or 26 fluid ounces of 38.5% sulfuric acid are added to 10,000 gallons of water (the actual drop in pH is dependent upon both the starting TA and pH).
What occurs if the pH in the pool is too high?
The pH is unaffected by the surface material of your pool. Different pH levels can have harmful consequences on your body as well as your swimming pool. Let’s examine what might occur and what the ideal pH for swimming is.
What is the Ideal pH Level for Swimming?
To kill bacteria, chlorine is a chemical that is added to swimming pool water. To protect the eyes and skin from harmful substances, the proper pH levels should be attained.
The optimal pH range for swimming is between 7.2 to 7.8, according to the Centers for Disease Control and Prevention. Since our bodies’ pH levels fall within this range, swimming won’t harm us physically.
What Happens in a High pH Swimming Pool?
Alkaline pools are those with high pH levels, which can be problematic for both the pool and the swimmers. There are several possible explanations for why a pool’s pH is high, such as an abrupt increase in water temperature, but it’s more crucial to understand that causes are also effects. Scaling will likely appear around the pool sides and the water will likely get hazy if the pH is higher than 7.8.
Additionally, an elevated pH makes it difficult for chlorine and other disinfectants to complete their jobs. This implies that bacteria and other microbes might flourish in your pool. While germs in your pool water are invisible to the naked eye, they can still be dangerous to you if they get into your body. Learn how to naturally lower the pH of a pool by reading on.
What Happens in a Low pH Swimming Pool?
You may actually feel the difference as you take a dip and swim, but swimming pool water with a low pH level (lower than 7.0) is acidic. If you swim in an acidic pool, you should prepare for skin rashes and burning eyes as soon as you open your eyes underwater.
Chlorine and other chemicals might not be as effective in pool water with a low pH as they would be in an alkaline pool. If the water is overly acidic, vinyl pool linings may wrinkle and metal pool components may rust.
Getting the Right pH Level
Be ready for some trial and error since you might not achieve the ideal pH level for your pool water all at once. Always start modestly when introducing additions. Check
If the pH measurement is either too high or too low, find out below what to add to the water.
- Low pH: Add sodium bicarbonate to boost the pH if the pool water is acidic. Depending on the pH, the levels change. Every 10,000 gallons of water should have about nine pounds of sodium bicarbonate added.
- High pH: If the reading rises too high, follow these steps to reduce the pH in a pool: Add a dry acid, like sodium bisulfate. In accordance with the pH value, adjust the dry acid amount that you add. For instance, you should add 900 grams of sodium bisulfate to a 50,000-gallon swimming pool if the pH level is 8.0.
After adding the proper ingredient, keep an eye on the pH of the water. Continue to administer the agent to reduce or raise the pH if it hasn’t stabilized after two days.
You can use a dry acid like sodium bisulfate or a liquid acid like muriatic acid (hydrochloric acid), depending on the depth of your pool, to lower the pH level of the water.
It might be challenging to balance the pH of an overly alkaline swimming pool. The water in a pool with an excessive pH level will be murky. Additionally, you can see scaling on the pool’s walls, and the chlorine is no longer efficiently cleaning the water as it once did.
pH values range from 0 to 14. The midpoint, 7, is considered neutral. Anything that is less than 7 is regarded as acidic, while anything that is above is seen as alkaline. The ideal pH for swimming pools is 7.4, which is also the pH of our mucous membranes and eyes. Additionally, it is at the ideal level for chlorine to function properly.
Pool owners should not ignore this work in addition to routine pool maintenance, which includes changing the pH level of the water. Can you swim in a high pH pool? Yes, but be aware that the water’s chlorine may not be as efficient as it usually would, and you might be exposing yourself to dangerous germs. Alkaline water can also cause the water to get hazy and your pool’s walls to scale. Our experts at Regal Pools are happy to assist you if you need additional information on how to maintain the pH balance of your pool.