Treatment FAQ

why does shock treatment turn the pool green

by Helen Bogan Published 2 years ago Updated 2 years ago
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Pools can immediately turn green after shocking when they have metals like copper in the water. These metals oxidise when exposed to high levels of chlorine which makes the pool water turn green. Adding a metal control product such as Zodiac Metal Remover will help to restore the pool water.Oct 27, 2021

Full Answer

Does shocking a pool clear it’s Green?

Shocking a pool should help clear up a green pool if the water is green because of algae or other issues. However, the pool may turn green after shocking, which is caused by an increased amount of dissolved copper in the water. This copper can occur naturally in the water or come from copper plumbing that is leeching into the pool.

Why is my pool water green?

Although algae growth is the primary source of green pool water, it is not the only one. Other things like high copper content and pollen can leave you with a green pool. If the water has too much copper, pool shock oxidizes it and turns the water green.

How long does it take for shock to turn water green?

Shock turns water green. If you have metals in your water it depends on the chemical remover you have how long to wait before shocking. Some take 24-48 hours, and some take up to a week. Also, when you do have metals in your pool, ou need to clean your filter as well.

What happens when you shock a swimming pool?

Shocking increases the amount of free chlorine that is in the water so that it is about 10 times more than the amount of chloramines in the water, which kills all organic matter in the pool in a chemical reaction. Shocking a swimming pool should be done about once per week.

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How long will pool be green after shock?

If you're trying to clean up a green pool after shocking, you want to run that filter for 24-48 hours. Or possibly longer. Running the filter will cycle all of your pool water through it and pick up algae and other contaminants. It's these contaminants that can cloud your pool or make it look green.

Can too much chlorine turn pool green?

The free chlorine levels might be low. But be careful—adding too much chlorine in pool water can cause those metals to oxidize and turn the pool a different shade of green. If you're struggling with balancing chlorine, you can consult a pool professional to discuss other options for sanitizing your pool.

Should I shock my pool again if it's still green?

If you still have a green pool after your first round of shock, add more! Fully ridding your pool of algae may require 3x or 4x the regular amount of shock to get the job done. The shock will not only kill the algae, but it will also clear up your pool water, bringing it back to its normal blue color.

Can you put too much shock in a green pool?

Can you put too much shock in a pool? SKIMMER NOTES: It's unlikely but it could happen. It would take a lot of shock to really make the water unsafe for swimming. The best way to make sure you're safe to swim is to test your pool water and make sure free chlorine levels are between 1-4ppm for healthy swimming.

Why did my pool turn green overnight?

The most common reason pool water turns green is due to algae growing in the water. Algae can grow rapidly, particularly in hot weather, which is why it can surprise you overnight during the warmer months. This generally comes down to an imbalance or lack of chlorine in the water.

What happens if you put too much shock in a pool?

Although, if you overdo the shock treatment, you risk getting green hair from chlorine due to the excess chlorine oxidizing the copper in the water. You can execute a shock treatment with a few different types of pool shock, just be mindful of how much you're using.

How do I get rid of green water in my pool fast?

1:036:33How To Clear A Green Pool FAST | Swim University - YouTubeYouTubeStart of suggested clipEnd of suggested clipIf you have a concrete pool it's best to use an algae brush algae is tough and will stubbornly cleanMoreIf you have a concrete pool it's best to use an algae brush algae is tough and will stubbornly clean to the pool's.

Why won't my green pool clear up?

Green or cloudy water will quickly clog a filter, therefore you may have to backwash your filter many times a day until the pool clears. THIS IS NORMAL ! Remember, you cannot over-backwash a pool filter. The more you run your pool, and the more you backwash the filter, the faster the pool will clear up.

How long should you run filter after shocking pool?

While shocking your pool will help kill any germs any algae, it won't actually get rid of them; for that, you need your filter. So be sure to run your pool filter for at least 24 hours.

How long does pool shock take to work?

Always run the pump when shocking the pool and allow it to circulate for 24 hours. The water should then be a blue or cloudy blue color. Test the water 24 hours after shocking and start adjusting pH and alkalinity levels. The chlorine will still be elevated, but over a few days, it should stabilize.

Should I shock my pool every week?

How Often Should I Shock My Pool? Shocking your pool regularly will help to keep the water clean and free of contaminants. You should aim to shock your pool about once a week, with the additional shock after heavy use. Some tell-tale signs that your pool needs to be shocked are cloudy, foamy, green, or odourous water.

Should I backwash after shocking pool?

Steps for Preventing Algae If your pool is used frequently, shock it at least once a week. Clean or backwash your filter regularly. Run your pool pump for at least 10 hours per day to completely circulate the water. Keep your phosphate levels below 100 ppb (parts per billion).

Can algae grow when chlorine is high?

Yellow/ Mustard algae is very resistant to even high chlorine levels and will grow and thrive in a chemically well-balanced pool.

How do you fix a green pool fast?

1:036:33How To Clear A Green Pool FAST | Swim University - YouTubeYouTubeStart of suggested clipEnd of suggested clipIf you have a concrete pool it's best to use an algae brush algae is tough and will stubbornly cleanMoreIf you have a concrete pool it's best to use an algae brush algae is tough and will stubbornly clean to the pool's.

How do I get my green pool clear again?

How to Fix Green Pool Water FastBrush the Pool Walls and Floor. ... Test The Alkalinity and pH Level. ... Shock Your Pool with Chlorine to Kill Algae. ... Run Your Pool Filter for 8 Hours (And Shock Again If Needed) ... More Water Testing and Adjust Pool Chemicals.

How can I clear my green pool fast?

Follow the below steps to clear up your green pool in 24 hours:Test the pool water.Balance your chemicals and PH accordingly.Remove any debris.Shock the pool.Brush the pool.Vacuum the pool.Run the pump for continually for 24 hours.

6 Reasons Your Pool is Still Green After Shock

Pool shocking requires you to perform breaking point chlorination, meaning you have to add enough chlorine to break the molecular bonds of contaminants like algae and bacteria.

Bottom Line

It can be disheartening to find that your water still looks green after all the energy and time you spend shocking. However, if you can identify the reason, the problem is easy to fix.

Why does my pool turn green after shocking?

However, the pool may turn green after shocking, which is caused by an increased amount of dissolved copper in the water. This copper can occur naturally in the water or come from copper plumbing that is leeching into the pool.

Why is my pool green?

Swimming pool owners may find their pool water turns green after they shock it. When swimming pool water turns green after being shocked, it is generally because there are metal particles in the water.

How to prevent pool from turning green?

If your plumbing is made of copper or there are copper elements in or around the pool, you may need to test and treat your swimming pool more often to prevent it from turning green ...

What does shocking a pool do?

Shocking a swimming pool is a method of extremely sanitizing the swimming pool water. Shocking increases the amount of free chlorine that is in the water so that it is about 10 times more than the amount of chloramines in the water, which kills all organic matter in the pool in a chemical reaction .

How to clean a pool after shocking?

Answer: After shocking the pool, it will need filtration and circulation. Run the pump as much as possible. Keep the filter clean (daily) until the water runs clear. Be sure to brush the pool often during this process as above-ground pools do not have drains at the bottom.

Why is my pool cloudy?

If so, the filter needs to be taken apart and cleaned or repaired, and your pool will remain cloudy until the repair is made.) So remember, a cloudy pool can be caused by a bad filter. If the pool is being filtered properly, you won't need a clarifier solution.

Why do I use liquid chlorine?

I use liquid chlorine because granular chlorine will leave a residue that is harder to filter out. If the pool has a DE filter, then I will use granular chlorine (about 5 pounds). This article shows how I shock a pool with a DE filter. Remember to test the water before adding shock.

Why is the pH of a pool low?

The pH should ideally be low when shocking the pool (around 7.2) because shocking the pool will raise the pH level. Remember that shocking alone does not clear up a green or cloudy pool; that is what the filter is for. It doesn't matter how much shock you put in the pool if you have a bad filter. 4.

What should the pH of a pool be?

Correct pH: For normal use, your pool’s pH should be between 7.4 and 7.6: for shocking, it should be between 7.2 and 7.6. Shocking a pool with too high pH will cause cloudiness. Correct alkalinity: The right range of alkalinity (dissolved salts that keep pH stable) makes pH and chlorine levels easier to maintain.

What are the chemical requirements for a clear pool?

Basic Chemical Requirements for Clear Pool Water. Just to summarize, these are three basic chemical requirements for a pool that stays clear. Free chlorine: Unless the water has a sufficient free chlorine level , algae will grow and make your pool green and cloudy.

How many gallons of water is a green pool?

How "green" is it? If your pool is a normal residential-sized pool of 13,000-25,000 gallons (the pool pictured at the top of the article is around 18,000 gallons), then your options are liquid chlorine or granular shock.

What happened to your pool water?

While it’s easy to assume that it’s algae that are causing the green water, we must remember that we started off with a crystal clear pool and we just shocked it. The first thing we should always do when we have green pool water is to test our chlorine levels.

Dealing with green pool water caused by heavy metals

Since it’s a metal issue causing the green water in your pool, then we must address the metal contaminants in our pool and we have a couple of options to go with it.

Preventing green water caused by heavy metals

It goes without saying that if we want to prevent green water caused by metals is to prevent metals from entering your pool water in the first place! Now depending on the source of the metal contamination in your pool, the prevention method may be different.

Conclusion

As you can see, green pool water isn’t always caused by algae, it can be caused by the actual things that you use to get rid of algae (chlorine!) So the next time your pool water turns green after shocking, don’t reach for more chlorine thinking that it’s an algae bloom.

Why is my pool green after adding chlorine?

Lo - Chlor. Copper is one of the most common heavy metals found in a swimming pool , and often the reason your pool turned green after adding chlorine.

Why is my pool turning brown?

Iron reacts with chlorine to form iron III chloride, which is reddish in color. This is why your pool may turn to brown or rusty color when chlorine is added. 3. Using Metal Pipes and Pool Parts. During the construction of a swimming pool, copper, iron, silver, or any metal may be used in pipes and heaters.

How to remove metal stains from pool?

Steps for Clearing Metal Stains in your Pool 1 Get your free chlorine to 0.0 ppm by not adding more chlorine. This might take a few hours or days depending on the level of FC in your water. 2 Add in the Swim's Polyquat 60 Algaecide after getting the chlorine to 0.0 ppm to prevent algae from growing in your pool during the process that might take a few days. Polyquat 60 or 60 Plus is the best algaecide for swimming pools, because it introduces no copper in your water and is also very effective in preventing algae. 3 Get your pH to 7.2 using pH minus. 4 Put your filter on circulation and add 1 pound of ascorbic acid for every 10,000 gallons of water in your pool to get stains away within 24 hours. 5 Get the pH back using pH Plus. Then raise the TA using an alkalinity increaser, since ascorbic acid will reduce both. 6 Add chlorine to raise your FC to around 3 to 4 ppm.

How to get a pool to 7.2?

Get your pH to 7.2 using pH minus. Put your filter on circulation and add 1 pound of ascorbic acid for every 10,000 gallons of water in your pool to get stains away within 24 hours. Get the pH back using pH Plus. Then raise the TA using an alkalinity increaser, since ascorbic acid will reduce both.

How does a metal sequestrant work?

Metal sequestrants work differently by preventing metals from coming out of a solution inside a swimming pool. By preventing metals from separating in a solution, pool parts will not be discolored and water colour will not change.

What color does copper turn?

Copper turns to a light green color when oxidized by chlorine inside your pool. Other metals you may find in your pool—especially when using well water—are silver that turns to black, iron that turns brown/rust, and manganese and magnesium that turn to purple when chlorine is added to pool water with compounds of these heavy metals.

Why does my pool water discolor?

It could instead be because of heavy metal presence in your water that is causing metal stains.

Why does my pool turn brown?

If people are complaining that their pool turns brown/green/red/yellow when they put shock in and then you take it to the pool store and they test for metals, many a time the test will result in negative metals because the metals have already had a reaction with the chlorine and won't register .

How long does it take to remove metal from a pool?

If you have metals in your water it depends on the chemical remover you have how long to wait before shocking. Some take 24-48 hours, and some take up to a week. Also, when you do have metals in your pool, ou need to clean your filter as well.

How long should I let water circulate before adding chlorine?

BE sure to let the water circulate for at least 24 hour before adding chlorine. IF you have a cartridge filter be diligent on taking it out and rinsing it off at least 4-8 times daily to keep the color from reentering the pool, until you have removed the metals. Top.

Why is my pool green?

It is also possible that a pool can turn green from exposure to oxidized copper. This is a rare occurrence, since it can happen only when pool water comes in contact with copper, usually via corrosion in copper heaters. This probably isn’t the source of your problem, unless you have oxidized copper somewhere in your pool.

Why shock a pool?

Shocking your pool is a multi-step process, and it can feel intimidating to handle so many chemicals. Many people manage this successfully on their own, while others prefer to have a professional shock their pool for them, to ensure that they get the complex balance of chemicals exactly right. Either way is fine, as long as you feel your pool is ...

Why is my pool algae growing?

Determining the cause of the algae growth. Too-low levels of chlorine are the likely culprit of a chemical imbalance that leads to algae. When there is not enough chlorine in your pool water, green algae—which can float freely or attach to the walls and floor of your pool—can grow. Thus, in many cases, the most efficient way to get rid ...

Why does algae bloom in pool water?

It is even more common, however, for there to have been an ongoing, undetected chemical imbalance in your pool water that enabled algae to grow. As a rule of thumb, the deeper the shade of green, the more algae has bloomed.

How to get rid of algae in pool?

Thus, in many cases, the most efficient way to get rid of algae is by shocking your pool water with chlorine. There are a number of ways to treat your pool with chlorine, some of which can be handled on your own; others are best overseen by a pool specialist.

How to make a green pool blue?

In most cases, the quickest way to turn your green pool blue is to shock it . This is also called super-chlorination, and it is the process of adding enough chemicals—usually chlorine, but sometimes something else—to eliminate built-up chloramines, along with algae, bacteria and other organic matter. Shocking your pool is a multi-step process, and ...

How long does it take to dissolve shock in pool?

After pouring the shock (or shock mixture) evenly around your pool, run the filtration pump for at least 24 hours to clear contaminants, germs and algae from the pool.

Why does my pool look unwell?

Issues with metals being present in the water, specifically copper, can be the reason your beautiful pool looks unwell. This is actually a common occurrence with new pools after filling them up and shocking the water. What’s happening here is the chlorine from the shock is oxidizing the copper in the water.

How to fix pollen in pool?

Step 1. Filter & Skim. Begin by running the pump so the filtration system can catch the pollen as it leaves the pool. While it may not get rid of it all, it can catch quite a bit.

What color is algae in pool?

There’s three types of algae that can accumulate in your pool water: green algae (green color), mustard algae (yellow-green), and black algae (dark green). Although they’re all worth your attention, green and mustard algae are the ones that cause a dramatic water color change.

Why is my water filtration system off?

If the filtration system is off for long periods of time, the water won’t circulate and impurities like pollen won’t be filtered out.

How to check chlorine level in pool?

Step 1. Test & Balance Your Pool Water. First thing you need to do is test and balance the water in your pool. Using test strips or a liquid test kit, make sure the pH level of the water is at 7.8, by raising or lowering it accordingly. Also, your chlorine level needs to be adjusted so that it’s sitting over 1ppm.

Why do pools have algae?

Many owners use algaecides as a preventative measure to keep algae from even getting into their pool. Once it’s in it can be hard to eliminate, and it can lead to extra maintenance and even staining of your pool’s finish .

What color is pollen?

To a lesser extent than the first two culprits, but not to be discounted, is good ole pollen. Pollen is green or yellow in color. Yellow mixed with blue water, will create a green tint. Pollen doesn’t float on the surface or cling to walls, but it will float in the water until you get rid of it.

What is phosphate in a pool?

High Phosphate Level. Phosphates are compounds that Goodale calls “super food for algae.”. They commonly find their way into pools from detergents and fertilizer runoff. When phosphate levels in your pool go above 500 parts per billion, the chlorine struggles to do its job.

What to use to test phosphate levels in pool?

If your phosphate level is too high, use a phosphate remover, such as Clorox Pool & Spa Phosphate Remover.

How to check CYA level in pool?

Find out your pool’s CYA level by taking a water sample to a pool and spa store so they can properly test it. CYA is hard to remove from water. Often the only way to fix the problem is to partially drain the pool and refill it with fresh water. Going forward, watch how many chlorine pucks you add to your pool, because they also contain CYA.

What should the chlorine level be in a pool?

A pool’s free chlorine level should be between two and four parts per million. If a chlorine test, such as PoolmasterSmart Test 4-Way Swimming Pool and Spa Water Chemistry Test Strips, reveals a lower number, add more chlorine to the pool water until it’s in the desired range.

How often should I run a pool filter?

“A residential pool filter should run enough to filter the volume of the pool at least three times every 24 hours because not 100 percent of the volume gets filtered each time,” he says.

Why is my pH high in salt water?

That’s because saltwater pools generate chlorine that will cause a high pH if you’re not keeping a close eye on things. You can test your water’s pH regularly, but know that many test strips are not ideal for testing pH because they do not test beyond 8.2.

What is CYA in pool water?

Cyanuric acid (CYA) is a water conditioner and stabilizer that prevents chlorine from degrading in sunlight. The CYA level in pool water should be between 30 and 50 parts per million. Any higher means trouble. “Once you get around 80 to 100 parts per million or more, the chlorine can no longer do its job effectively,” explains Steve Goodale, a writer and technical specialist who reaches millions of pool and spa owners each year through his Swimming Pool Steve resource blog and YouTube channel.

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Pool Still Green After Shock?

  • So you thought your green pool would be easily fixed with some shock? Here are some reasons why that didn’t work.
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Consider The Nuclear Option

  • Unfortunately in some cases of green water, the pool can be too far gone to bring back to life and you’ll have to do a partial or full drain. But, as filling a pool skyrockets your water bill, this should always be a last resort. If you can still see the floor in the shallow end of the pool, it may have a fighting chance. Run the filter non-stop, brush and shock like there’s no tomorrow, and endlessly …
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Green, Green, Go Away!

  • If your pool is still green after shock has been added to the water, fear not. There’s countless reasons why this may be happening, as evidenced above. Equipping yourself with the right knowledge about green pool issues will help you diagnose, and ultimately, restore the water color so you can spend more time enjoying the pool, and less time fixing...
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