How to adjust water ph

How to adjust water ph

Whether you’re growing plants hydroponically — that is, with the roots immersed in water — or in soil, the pH of the growing medium around your plants is important for ideal growth. The pH of your growing medium can be acidic, basic or alkaline, or neutral; generally, plants thrive with a pH of about 5.5 to 6.5. Below that, plants are acidic, and above that, they’re basic or alkaline. If you’ve discovered that the pH of your growing medium is out of whack, you can use a number of different ways to fix the problem.

Add the nutrients or fertilizers that you’re currently using for your garden. If you’re growing hydroponically, wait about one hour before you move on to the next step. If you’re growing in soil, wait about 24 hours.

Test the growing medium by inserting a pH test strip or electronic test kit into it, following the instructions on the test kit to ensure proper testing. Read your pH level and compare that to the ideal pH for the type of plant you’re growing to determine whether you need to raise or lower the pH of the growing medium.

Fill a gallon jug with clean water. Depending on the substance you’re using to adjust your pH, you may be instructed to use a different amount of water. Be sure to read the instructions on the bottle or talk with the retailer for instructions on the proper water-to-substance mix.

Add lime, wood ash or a specially formulated solution to the water to raise the pH, or add sulfur, phosphoric acid or a pH-lowering solution lower the pH. If you’re adding solid materials to a liquid solution, allow the material to soak in the water for a few hours to allow it to “steep.”

Water your plants with the solution. If you’re growing in soil or another solid such as perlite, water the plants with the solution in the same way you would water the plants with regular water. If you’re growing hydroponically, add the solution to your hydroponic solution.

Test the pH again following the treatment, to determine whether you need to do another treatment. For hydroponics, wait about 30 minutes to test the pH again. For soil and other solids, wait about 24 hours.

Things You Will Need

Lime, wood ash, phosphoric acid, sulfur, phosphoric acid or commercial pH-altering solutions

Check out Bru’n Water.
It’s a spreadsheet that will answer your questions and help immensely.

Added bonus is the designer is a member here and he and some others over in the brew science forum are very knowledgeable.


Well-Known Member


Supporting Member

Tap water pH is important when you are using it to sparge. Sparge water should be adjusted to a pH of about 6. The grains continue to provide buffering capability, especially when batch sparging so you don’t have to acidify down to the mash pH.

The minerals in your tap water are what is significant, especially with respect to your mash so knowing those is key.


Well-Known Member

pH of sparging water is not really the parameter we need to be targeting. Reducing alkalinity to a very low level is actually our goal for sparging water, but its not as easy to measure as pH is. pH is sort of a stand-in for us to measure when acidifying water and neutralizing its excess alkalinity.

As many of you know, water pH drops very slowly in water that has alkalinity. But at some point, most of the alkalinity is neutralized and the pH drops like a rock. In a related way, using pH as the targeted variable can get you in trouble too.

If your tap water has high alkalinity, it can turn out that you actually need to target a much lower pH in order to knock out most of the alkalinity. So for water like RO or other low alkalinity water, targeting a pH of 6 could be fine. But for a water with high alkalinity, you may need to push that pH target down to the 5.4 or 5.5 range to neutralize enough alkalinity to avoid sparging pH and tannin extraction problems.


Supporting Member

The tap/sparge water PH is completely irrelevant. What *is* important is it’s buffering capability, it’s alkalinity.

Do not confuse your water pH with the pH of the mash. It is not the pH of the brewing water but it’s residual alkalinity that is important. This factor and the activity of the mash will determine the pH level reached and will let you know what additions you may need to reach the optimum mash pH range. Get a water report that shows the important brewing ions and the bicarbonate/alkalinity level of the water. You can check out the link below for a start on some water info.


Well-Known Member

More info from John Palmer:

Read through this presentation – Palmer notes that the mash pH is the important consideration – water pH is not as important.


Well-Known Member


Well-Known Member


Well-Known Member

Got Trub?

Well-Known Member

You can also calculate it if you have your water analysis. The equation is:

Mash pH = 5.8 + (0.028*((CaCO3*0.056) – (Ca++ * 0.04) – (Mg+*0.033))) – (%dark malt)/40

5.8 is pH of distilled water (do not substitue your water pH)
Concentrations are in ppm
The pH change by dark malt is an approximation based on results published in Ray Daniels book

Again to re-iterate what has been posted above it is not your waters pH that dictates your mash pH but rather the constituents in your water and the amount of dark grain in your mash. As you can see from the equation your waters pH is not a component.

In terms of hop harshness your water definitely will affect that. It is for that reason that Burton on Trent is famous for its IPA’s. It’s their water.

PH is the value that defines a scale, same as temperature. It doesn’t mean that pH isn’t a physical parameter which may be measured in a quantity or a concentration.

This is a mark between 0 and 14 defines the measurement of acidity of water in a logarithmic scale. If the number is lower, the water is more acidic.

When the number is higher, the basic is more. pH level 7 is considered neutral. At the time of counting down, pH below 7 is 10 times more acidic than the previous digit. While counting above, pH 7 is 10 times more basic the last number.

pH refers to power of hydrogen. The numerical pH value is defined by the molar concentration of hydrogen ions (H+) ³. It is possible for receiving the negative logarithm of H+ concentration (-log (H+)).

When H+ concentration of a solution is 10-3 M its pH solution may be log (10-3). It equals 3.

This is for the effect of hydrogen ions (H+) and hydroxyl ions (OH-) on pH. If H+ concentration is higher, the pH is lower. On the other way, when OH- is higher, pH is the higher.

Neutral pH is 7 and the concentration of H+ and OH- ions is 10⁻⁷ M. So OH- and H+ make a pair. When the level of one is increased, the other decreased without thinking of pH.

The total of ions equals 10⁻¹⁴ M ². Therefore OH- and H+ are connected to the main definitions of bases and acids.

Why is pH Important?

When the pH of water is very high, the aquatic organisms live within it faced death.

Moreover, it affects the toxicity and solubility of heavy metals and chemicals in the water.

Most aquatic creatures like a pH range of 6.5 to 9.0, though some can survive in water with pH levels beyond this range.

If pH level goes up and down much, it affects the animal system and reduces hatching and survival rates. The other great consequence is higher mortality rates.

For higher pH level, more sensitive species are significantly affected. Besides biological effects more pH levels and increases the solubility of compounds and elements.

Some elements make poisonous chemical more mobile and promote the possibility of absorption by aquatic life.

Not only are the aquatic species affected by pH. The human can endure high pH levels. Still, they remain in danger. When pH level is more than 11, it can create eye and skin irritation like pH below 4.

If pH level is under 2.5, it causes irreversible damage to organ linings or skin. Lower pH levels also enhance the probability of mobilized toxic metals which may be absorbed even by humans.

pH level more than 8.0 may not be disinfected with chlorine. It also causes other indirect risks.

Moreover pH level outside 6.5 to 9.5 damages and corrodes pipes and other water supply systems. It increases heavy metal toxicity.

Sometimes minor pH has very long-term effects. Only slight change of pH of the water may increase the solubility of phosphorus and other nutrients.

This makes them more accessible for the growth of the plants. In an oligotrophic lake and high dissolved oxygen levels, it creates a chain reaction.

Moreover, it increases the necessity of dissolved oxygen in aquatic plants and algae thrive. It makes eutrophic lake which is full of nutrients and plant life.

There have low in dissolved oxygen concentration. When pH level increases in a eutrophic lake other living organisms become stressed.

The pH level of water may be lowered or raised to make it more compatible for any uses. Water with no pollutants or impurities, pure water has a pH level of 7 that is thought to be neutral.

The pH measurement scale ranges from 1-14, where one is most acidic and 14 in most alkaline or basic. The top dangerous acids have the lowest pH, like hydrochloric acid, whose pH is one.

On the contrary, sodium hydroxide has pH level 14. So it has the highest pH levels. Adding alkaline or acidic chemicals of water is a normal way to remove the water’s pH levels.

STEP 1: Purify Your Water

Distiller gives a super effective method to remove the poisons from the water. Keep note that Medical consultant Dr. Andrew Weil explains that distillation normally removes all viruses, bacteria, and contaminants.

Distiller purifies water by boiling first then collects the steam and lastly condensing the water into droplets to the top of the storage container. The droplets cleanse of bigger elements as well as they are added to the storage jug. Some distiller units may be expediently hooked to your refrigerator’s ice and water unit.

STEP 2: Test The pH Of Your Water

How to adjust water ph

When water is purified and tests the pH level of water. You can enter pH test strips to test the pH level of water from the local fitness food stores or from online. Making conscious of the preliminary of pH of your purified water to ensure you a super idea how much of an adjustment is a must to get your expected level of pH.

STEP 3: Pick One Of These Additives To Make Your Water More Alkaline

  • Baking soda: Author and Researcher Dr. Robert O. Young has given importance on pH balance for over 2 decades. Besides he has considered the systems to develop the alkaline stages in the diet by adding alkaline elements in purified water. He suggested adding a half teaspoon of baking soda with a gallon to purify water and shake it well through to mix it completely. As baking soda is greatly alkaline, adding little amount of water may result in a gallon of alkaline water.
  • Fresh lemons: If you do not use baking soda in your consuming water it is not a matter. Just add a fresh lemon in your drinking water. It will make you purify drinking water more alkaline. It is important to keep in mind that fresh lemon is anionic. When you drink the sharp lemon water, it may become alkaline since the body responds with the lemon’s anions while the digestive process is going on. Use fresh lemon which is being exposed in the fresh air for over 30 minutes- do not use lemon juice or lemon that is being cut and kept open for all the day long.
  • Drops: The other alternative to developing the alkalinity of your fresh water is to add drops made for this purpose. There are few over the counter drops in the market which may be bought at health food stores or on online. Strictly follow the instruction to confirm the right amount to get your aspired effect.

STEP 4: Test the pH of Your Water Again

When you finish adding drops or baking soda in your water purifier, test the pH level of your water once again by using a test strip. Then you will get it the place where you like to get it.

Keep in mind; clean lemon water can test acidic prior you like to drink it. On the other hand, once again it will be alkaline at the time of digestion.

If the pH of the mash is too low (too acidic) the addition of Calcium Carbonate will work well to raise it. In some cases, especially if you are making a very dark beer such as a Stout or Porter, you may have to settle for a mash pH as low as 5.0, but under no circumstance should you add more than 2 teaspoons of calcium carbonate to a five gallon mash.

If the pH of the mash is too high (too basic/alkaline) the addition of calcium in the form of Calcium Sulfate (aka Gypsum) or Calcium Chloride is the most acceptable way to lower it.

To raise or lower the pH of a Mash , additions of calcium carbonate (to raise pH) or calcium sulfate / calcium chloride (to lower pH) are recommended.

  1. Add ½ teaspoon at a time
  2. Mix well
  3. Recheck the pH after each addition

If these are not available, or if you are brewing with very soft water, then the addition of phosphoric acid can accomplish acidification of the mash. Teaspoon additions can be added incrementally until the desired pH is achieved.

Another product available is called Mash Stabilizer. This product will automatically lower, or raise, your mash to 5.2 pH. All you do is add it to your mash tun, and it does the rest. Mash stabilizer is a very easy product to use that eliminates the need to use pH Strips or a pH meter.

Acid Rest Technique

There also is a technique called an “”acid rest”” which can be employed to lower the pH of the mash by varying degrees. The enzymes responsible for this are most active at a resting temperature of 95 °F for 15 minutes to a half an hour. So, start your mash at 95 °F for 15 – 30 minutes, then raise the temperature to the standard 152 °F for however long the recipe calls for.

If you are trying to raise the temp in our All Grain Brewing Cooler Systems, we recommend draining a gallon of wort from your mash tun, bring it up to a boil, and then add it back into your mash tun. Make sure to stir the hot wort back in so the higher temperature disperses throughout all the grains. This will usually get you very close to the 152 °F range.

The pH level of water defines how acidic or basic it is. While some plants grow better with a higher, or more basic or alkaline pH level, others need a lower, or more acidic pH level to thrive (See Resources 1). By adjusting and maintaining the pH level of the water you’re feeding your plants, you can influence how well they absorb nutrients and grow. Adjusting pH levels require some preparation, but in the end your plants will thank you for it.

Include any nutrients you intend on adding to the water before you start the process. Nutrients can influence the pH levels of the water, so you want to test after making any changes.

Test the pH level of the water using a pH tester. If you’re looking to save some money, try pH paper test strips. This inexpensive alternative uses pH sensitive strips that change color to correspond to the pH levels of the water. You then compare the color of the strip to a chart that tells you whether the pH level is high or low. A more accurate, but expensive, way to check pH levels is to buy a digital tester. While more precise, these can cost you upwards of $50.

  • The pH level of water defines how acidic or basic it is.
  • By adjusting and maintaining the pH level of the water you’re feeding your plants, you can influence how well they absorb nutrients and grow.

Adjust the pH level using phosphoric acid to lower the level or potassium hydroxide to raise the level. Alternatives to phosphoric acid include nitric acid, sulfuric acid and citric acid. When adding any chemical to water, be sure to add gradually and using small amounts to ensure you don’t overdo it. It’s better to undershoot your mark and have to add only a slight bit more than to overshoot it and have to lower the level again or start from scratch.

Continue to test and adjust the pH levels of the water until you hit the mark you’re looking for. It takes practice, but eventually you’ll get a feel for how much of each chemical you’ll have to add to get the proper pH level.

Know the appropriate pH levels for the plants you’re working with before you adjust the pH levels of the water you’re feeding them.

Check the pH levels of your plants’ water and soil regularly to ensure you achieve the best results.

Some of the chemicals used to adjust pH levels can be hazardous. Wear proper safety gear when working with any chemicals.

I’ve lowered tap water pH from 7 to 6 using citric acid. After couple of hours pH raised again to 7.

What is the reason for this raise? Citric acid overcomes waters buffering feature then raise the $ce$ concentration in water. Why pH raise again?

The pH was measured using a pH meter.

How to adjust water ph

How to adjust water ph

3 Answers 3

If the water contains significant amount of bicarbonates, part of released carbon dioxide may escape and original bicarbonate is finally replace by the dihydrogen or hydrogen citrate.

So, the final $mathrm$ may not differ much from the original one, compared to the temporary one.

Maybe citric acid have had a negligible effect on the $mathrm$ . Everybody knows that in contact with air, pure water is carbonated by $ce$ from the atmosphere. And the $mathrm$ may go down to $5.5$ . Later on, the water may loose its $ce$ , and the $mathrm$ goes back to $7$ .

Oxygenated tap water is rich in transition metals including Fe and Mn ions. Citric is a source of H+ and a good chelate and can drive a redox reaction in the presence of oxygen and H+ proceeding as follows: $$ce<4 Fe^2+/Mn^2+ + O2 + 2 H+ --> 4 Fe^3+/Mn^3+ + 2 OH->$$

There is also a likely equilibrium reactions that can be effective in recycling ions (to continue the reaction, as occurs in natural waters) in the presence of citrate acting a chelate for, say, ferric:

Note: The above are active charge equilibrium reactions, referred to as a metal redox couple, and support the role of transition metals in their lower valence states engaging in notable radical creation formation via Fenton and Fenton-type (non-iron case) reactions. Further, in the presence of lab or sunlight, some further recycling of metal ions is possible.

Reference: See my comments and sources cited here.

The reaction with oxygen is electrochemical in nature with an inception period and proceeds with time.

Note: $ce$ is consumed, so the $mathrm$ would be expected to rise.

Here is also an electrochemistry reference, in particular, Table 2, where the first listed half-cell reaction corresponds to the above after adding two $ce$ to both sides (creating water as a product). However, as this reaction can produce basic salts, as I have discussed previously, I believe it is more informative. Further, I do prefer my rendition, as per my prior link supplied above, it could also display a possible radical chemistry underpinning to the underlying half-cell reaction mechanics.

You got a hot tub so you could kick back, relax, and unwind. But instead, unstable pH levels and screwed-up total alkalinity (TA) levels are driving you mad. You’re chasing chemical levels up and down your test strips, but you just can’t seem to hit the sweet spot in the middle.

First, the pH is too low, so you figure out how to raise the pH in your hot tub. But it goes too high, so you have to get a handle on how to lower the pH in your hot tub. You’re starting to feel like Goldilocks in a nightmarish fairytale where there’s no just right. Only all wrong.

Never fear. You can get your water chemistry under control before the big bad wolf—actually, cloudiness and scale deposits—huffs and puffs and blows your hot tub down. Or something.

Want to learn more about how to keep your hot tub balanced and sanitized? Then you should check out The Hot Tub Handbook and Video Course to help you save hundreds on chemicals and less time on hot tub maintenance all year long.

Tired of trying to keep your hot tub clean all the time and dealing with chemicals?

You’ll save $100 right away with this easy-to-follow digital ebook and video course. This is the ultimate maintenance guide that hot tub manufacturer doesn’t provide you.

How to adjust water ph

What’s Important About Hot Tub pH?

You might remember acids and bases from high school chemistry. When a solution (that’s a chemical mixed with water) contains extra hydrogen ions, it’s acidic. When the solution has fewer hydrogen ions than plain water, it’s basic.

On the general pH scale, seven is perfectly neutral water. Lower numbers are more acidic, and higher numbers are more basic.

When you test your hot tub water with test strips or a liquid test kit, they’ll show how acidic or basic your hot tub water is. Ideally, pH levels in your spa should measure between 7.4 and 7.6.

If your spa’s pH measures outside that range, you could be in for some unhealthy and potentially damaging water symptoms in your spa.

How to adjust water ph

Tests for 7 important chemistries in seconds: Total Hardness, Total Chlorine, Total Bromine, Free Chlorine, pH, Total Alkalinity, and Cyanuric Acid.

Low pH in Your Hot Tub

Any pH level below 7.4 could spell trouble. The lower the pH level, the more acidic your hot tub water is. Highly acidic water makes it more difficult for your sanitizer to work effectively, leaving bathers in your hot tub exposed to potentially harmful contaminants.

This increases your chances of being exposed to bacteria, such as pseudomonas aeruginosa (the cause of hot tub folliculitis) or legionella (which causes Legionnaires’ Disease), among others. Low pH in your hot tub may also cause corrosion in spa components, which can be expensive to replace.

High pH in Your Hot Tub

When your pH levels climb beyond 7.6, your spa water can be described as basic. What this means for you is poorly sanitized water, carrying the same risks as any other cause of ineffective sanitizing.

Basic spa water is also prone to forming scale and drinking pumpkin spice lattes year-round. Kidding—it’s not that kind of basic. But it really will cause flaky scale to build up on your spa surfaces.

The scale is due in part to high calcium hardness caused by the high pH. Cloudy water is another symptom of a high pH level in your spa.

What Does Total Alkalinity Mean?

You came here to learn how to balance the pH in your hot tub, so what’s this about total alkalinity? Well, the term technically refers to the ability of a solution to neutralize acids—or buffer them.

In your hot tub, the importance of measuring total alkalinity (TA) is only slightly different. TA acts as a buffer for the pH level in your water, keeping the pH level stable while allowing you to adjust TA without throwing the rest of your hot tub chemistry into chaos.

Total alkalinity is so important to your water balance, the first step in your water care process will always be measuring and adjusting TA before any other chemicals. The ideal range for TA is 100 parts per million (ppm) to 150 ppm.

To adjust alkalinity, add alkalinity increaser in small doses, one at a time. Allow each dose to circulate before testing again. Only after your TA is in the optimal range should you move on to adjusting pH. Achieving the right TA may actually get your pH in the target range.

How to adjust water ph

Balancing Your Hot Tub’s pH

When you have acidic water (low pH), you’ll add alkaline chemicals to increase the pH. When you have basic water (high pH), you’ll add acids to lower the pH. So you’ll get your TA perfect and then add some other stuff to fix your pH, right? Not exactly.

Using certain types of pH increaser or pH decreaser will likely also affect TA. This is why getting these two levels balanced can be tricky, but not impossible.

How to Raise the pH in Your Hot Tub

Most pH increasers contain the active ingredient sodium carbonate. You might recognize this chemical by its more common name—soda ash.

You may be thinking, that sounds an awful lot like sodium bicarbonate—baking soda. You’re right. They’re closely related, and baking soda will also raise the pH in your hot tub. But it’s not nearly as effective as soda ash. So when you’re considering how to raise the pH in your hot tub, choose soda ash over baking soda, and you’ll save yourself a lot of time and trouble.

Sodium bicarbonate is actually much better for raising TA, especially if you don’t want to affect the pH level too much.

It’s important to note that soda ash can also dramatically increase total alkalinity. So if your hot tub pH is low, but the total alkalinity is normal or high, sodium carbonate may increase the alkalinity beyond the recommended maximum level.

Also note that soda ash can make your hot tub water cloudy, so if you use it to lower pH levels, you may have to address a cloudy hot tub afterward.

How to Lower the pH in Your Hot Tub

Typically, the active ingredient in pH decreaser, sodium bisulfate, will also lower TA, sometimes so significantly you’ll need to bump your TA back up a little afterward.

Sodium bisulfate also helps stabilize pH, so if you do need to tweak your TA, it’s less likely to become an endless pH rollercoaster ride.

Muriatic acid is an alternative way to decrease both pH and alkalinity. Because it’s an extremely caustic chemical, you must use safety glasses, chemical-resistant gloves and a whole lotta caution when working with it. Here’s more information on lowering hot tub alkalinity.

To be even safer, you can use a muriatic acid replacement product that’s not as caustic. You’ll still need to wear the safety gear, though.

It’s not the best idea to just pour muriatic acid directly into your spa. You’ll need to dilute it, add it to your spa, then aerate it by running the jets. Finally, leave your spa to circulate overnight before retesting the water.

Every liquid, from the orange juice you drink at breakfast and the water in your fish aquarium to the blood running through your body, has a measurable pH level. To adjust pH levels, you must first determine the pH level you have and the pH level you want to achieve. Then, add either an acidic or alkaline substance to the liquid.

Meaning of pH Level

The pH (potential of hydrogen) level of an aqueous solution refers to how acidic or alkaline (basic) it is, based on its hydrogen ion concentration. Solutions with a high concentration of hydrogen ions have a low pH, and solutions with low concentrations of H+ ions have a high pH. The pH scale is a numeric scale, running from 0 to 14. On this scale, a pH level of 7 indicates neutral (neither acidic nor alkaline), a pH level less than 7 indicates acidic, and a pH level greater than 7 indicates alkaline. The equation that defines pH is:

pH=-log[H+] concentration

In other words, the pH is equal to minus the log of the H+ concentration. A difference of one pH unit (from pH 8 to pH 9, for example) is a tenfold difference in H+ ion concentration.

Adjusting pH in Water

Pure or distilled water has a pH level of 7, which means it is neutral. If you want to increase the pH of water, you must add an alkaline substance, such as baking powder, to it. If you want to decrease the pH of water, you add an acidic substance, such as lemon juice, to it.

As an example, it’s important to keep pH levels steady in the water in an aquarium because even minor changes to pH can have severe health effects on fish. A high (alkaline) pH can affect a fish’s gills and can be fatal. A low (acidic) pH can increase toxic elements in the aquarium, lead to eye damage and hyperplasia (thickening of skin and gills) and can also be fatal. Never make large, sudden changes to the pH in an aquarium. Adding 1 teaspoon of baking soda per 5 gallons of water is a safe amount for tiny increases if the pH is too low. Put peat moss into a mesh bag and add it to the filter to gradually lower a dangerously high pH.

Adjusting pH in Other Solutions

You can adjust the pH in any solution in a science lab or at home if you have the right equipment. First, fill a beaker with your solution. Insert a stir bar, turn it on, and keep it on throughout the whole process. Test the initial pH of the solution with a pH meter following the manufacturer’s directions for use. In most cases, you insert the meter’s glass electrode in the solution, wait up to 30 seconds, and then read the pH level displayed. Compare the actual pH with the desired pH. If the pH is higher than desired, adjust it using a hydrochloric acid solution. If the pH is lower than desired, adjust it using sodium hydroxide solution. Fill a plastic pipette with the correct solution, add a few drops to the solution in the beaker and wait at least 20 seconds before reading the pH on the meter. If you need to adjust the pH further, add more of the solution until you achieve the desired pH.