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why does my pool keep getting green algae

by Prof. Jennings Bednar DVM Published 2 years ago Updated 2 years ago
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Pool algae can be caused by poor filtration, out-of-balance water, low or inconsistent chlorine levels, or poor water circulation. Green, dark green, yellowish green and blue-green algae are the most common. Green algae are slimy and are the leading cause of green pool water.

Why does algae keep coming back in pool?

Pool algae occurs for many reasons. Low or inconsistent chlorine levels, faulty pool filtration and poor water circulation may be to blame. Preventing pool algae from flourishing helps to keep your pool operational so you can enjoy it all season long. The key to an algae-free pool is regular maintenance.

What is the fastest way to get rid of algae in a pool?

You can get rid of algae quickly by vacuuming and brushing your pool, balancing your pool's water chemistry, and then shocking and filtering your pool water. Just be thorough as you clean your pool surfaces. If you leave behind even a small number of algae spores, it won't be long before they regrow and bloom again.

Can high chlorine cause algae?

Surprisingly enough, too much chlorine can also cause your pool water to discolor, but no algae can grow in water with high chlorine levels.

Why does my pool get green so fast?

Green pool water is often caused by the presence of algae in your pool. Algae blooms can appear when your pool has a low Free Chlorine. Exposure to high heat, heavy rain or poor circulation, without the use of a preventative algaecide, also increase your risk of developing pool algae.

What kills algae permanently?

bleachUse bleach to kill the algae. If you have a problem with algae, you can use bleach to kill it all. The ratio should be one-quarter teaspoon for each gallon in your tank. Bleach is great for killing algae (and other organisms that may lurk in your tanks) and for keeping it from coming back.

Does chlorine keep algae away?

Chlorine is still one of the most effective killers of algae so doing a super-chlorination of 10-20 ppm of chlorine can go a long way towards wiping out the algae. Liquid chlorine is an ideal shock for algae because it is fast acting and does not add cyanuric acid (CYA) or calcium to the water.

Why is my pool still green after shock and algaecide?

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.

Why is my pool green but chemicals are balanced?

If your pool is green and cloudy, it's likely an algae problem. Algae can persist in a pool even after shocking. A green pool – especially one that turned green overnight or after rain, can also be from a pool pump that isn't properly circulating water or an issue with your filtering system.

Can too much shock cause algae?

Algae will remain in your pool after shock if you've had insufficient chlorine and an overabundance of metal elements in the pool water. Therefore, to start the cleaning process. Remove all the debris from the pool with a leaf net and then let the smaller dirt fragments settle.

Why does my pool turn green every two days?

Pool water turns green because of algae in the water. Algae can grow rapidly, particularly when it's warm like Summer, which is why it can surprise you overnight. This generally comes down to an imbalance or lack of chlorine in the water.

How do I get my pool to not be green anymore?

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.

Why is my pool green in 3 days?

A pool turns green when there is algae in the water. There are several reasons why algae could grow, but it is most commonly caused by prolonged exposure to the sun, rain and temperature spikes. These factors affect the chemical balance of the pool and result in the pool turning cloudy and/or green.

Does shock get rid of algae?

Apply a Shock Treatment Shocking your pool water helps to remove contaminants that may cause algae to grow and helps to improve water filtration.

How long does it take for algae to clear up in a pool?

How long will it take to clear the pool? A fiberglass pool in its worst condition can be algae-free in 24 hours. For a vinyl liner pool, the process can take 3-4 days. For a concrete pool, this can take a week or more.

How do you clear a green pool in one day?

Run the filter for 24 hours and backwash the pool filter around 4 times during the same day to get faster results. DE filters will clear green pools 50% faster than a sand filter.

What kills algae naturally in pool?

In the same way that baking soda can be a spot treatment for black algae, household borax does the same for blue and green algae. Simply use the borax to scrub away algae that's sticking to your pool walls, then use the brush to dislodge it. Follow up by vacuuming up or scooping out the free-floating algae.

Why is my pool water green?

Most likely, the reason your pool water is green is a chemical imbalance. There are several reasons your swimming pool water might be green in both inground and above-ground pools, and the fix will be different depending on which kind of imbalance you have.

Why is my pool a buffet for algae?

Phosphates in the water can be a food source for algae, so if the level of phosphates in your pool water (usually included in a basic pool water chemistry test) is too high, your pool is essentially a buffet for algae. The answer to this is balancing the level of chlorine or another sanitizer.

How to avoid pollen in pool?

To avoid too much pollen in the pool, use a pool cover when the pool is not in use. Have a pool professional check that your equipment is in good shape and isn’t deteriorating.

Why is chlorine used in drinking water?

Chlorine is used to purify water, including most municipal drinking water, because it will kill nearly any organism that could be harmful to humans. When the levels are properly balanced, chlorine will keep the algae at bay, but the water will slowly begin to turn green as the algae take over if there’s not enough.

What happens if the pH is too high?

The goal is to keep the pool water reasonably neutral, with a pH of around 7.3 to 7.6. If the pH becomes too high (over 7.8), it prevents the chlorine from doing its job.

How to get rid of phosphate in pool?

The answer to this is balancing the level of chlorine or another sanitizer. Some websites suggest aggressively scrubbing the water and walls or dumping heavy phosphate remover chemicals in your pool, but those chemicals won’t make the difference. Only balancing the chlorine levels will help.

Can chlorine make a pool green?

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. Photo: depositphotos.com.

What Causes Algae in Pools?

Algae can also be carried into your pool by someone’s bathing suit or by pool equipment. If your pool water is properly cleaned and filtered, the algae will be taken care of without much trouble and before it gets a chance to spread. An algae bloom can happen really quickly because algae are always available in pools at a microscopic level. It only takes a few hours for algae blooms to get started, especially if the pool gets low on chlorine levels, or the pump or filter are not running properly. A rising pH level can also indicate a problem with algae.

How to get rid of green algae in pool?

One way to get rid of green algae is a flocculant. This clumps the algae together and makes them easier to vacuum up. While this is an easier way than shocking the pool and waiting a few days, cleaning off the algae doesn’t mean the pool is safe. You will need to make sure your pool’s pH and chlorine levels are good before you can swim in the pool, ...

Why does algae bloom in pools?

An algae bloom can happen really quickly because algae are always available in pools at a microscopic level.

Why is my pool green?

No one wants a green pool. Usually, the causes of green pool water are algae, pollen or not enough chlorine in your pool.

How long does it take for algae to bloom in a pool?

It only takes a few hours for algae blooms to get started, especially if the pool gets low on chlorine levels, or the pump or filter are not running properly. A rising pH level can also indicate a problem with algae.

How long does it take to shock a pool?

Shocking the pool usually takes from one to three days. But, be prepared, it may take as long as a week if your pool was in poor sanitary condition. Before you use the chlorine, however, make sure you vacuum or sweep up all the algae on the bottom of the pool, as well as the off the pool walls and around the ladders.

Where is Pulliam Pool located?

We are located in Katy, TX and provide pool services throughout the Houston TX area.

How to clean pool after shocking?

After shocking the pool, break out your telepole and brush and give all of your pool surfaces a good scrubbing. Take special care to brush towards your pool’s main drain to ensure that any dirt that you brushed off will be sucked into your filtration system. If the pool water is extra cloudy after this step (depending on the severity of the algae bloom) you can use a flocculant to grab all of the particles so you can have a clear pool afterward.

How to prevent algae in pool?

As we’ve mentioned before algae can come with organic debris like leaves. So a regular skimming and scooping out of debris from your pool goes a long way to preventing pool algae. Of course, having great equipment like the Water TechniX pro leaf skimmer will make the task much easier.

What to do if your pool is oddly shaped?

If you have an oddly shaped pool or if for some reason you have corners that stubbornly end up with stagnant water, then a possible solution would be to get some directional eyeballs for your return jets to force the water in that area to circulate.

How does algae get its color?

Green algae gets its color from chlorophyll. For those that have already forgotten their biology 101 classes, chlorophyll is the powerplant for any plant. They convert light energy from the sun to create energy and multiply. This is the reason why your pool is the perfect breeding ground for algae to bloom and multiply. As the sun warms up your water, it provides energy to the algae and at the same time, the UV rays destroy your pool chlorine. It’s like the perfect storm for green algae growth!

What is pool algae?

Pool algae is usually classified by the color of the stain or of the water and not by their actual names. To be fair, nobody really calls pool algae by their scientific names since it’s well… just easier to call them by their colors.

Can you brush your pool?

We cannot stress the importance of brushing your pool surfaces. Regular vacuuming or suction cleaners will not dig out algae that have started to root on your pool surfaces. Think of it as part of your health regimen. Brushing and scrubbing your pool surfaces can give you a pretty good workout! But, if you prefer to keep your exercising to the gym, then you can always get a robotic pool cleaner like the Tornax TX30 to do the brushing for you!

What happens if you put chlorine in your pool?

If the amount of chlorine in the water is low, it could quickly cause algae growth in the pool.

What happens if a pool filter doesn't work?

However, if the filter doesn’t work properly or if a smaller filter is used for a larger pool, there is a chance that dead spots are going to occur in certain parts of the pool. These dead spots or low flow areas can promote algae growth.

Why does algae grow in swimming pools?

One of the main reasons why algae growth occurs in swimming pools is because of poor water circulation. You might not have realized it while swimming, but water continues to circulate throughout the pool on a consistent basis, moving from the pool into the filter and then back out again.

How long does it take for a pool to clear of algae?

You will need to run the filter consistently for around eight hours to get the algae completely out of the pool. To speed up the process, you should consider adding a bit of pool water clarifier.

How to tell if there is algae in my pool?

The most noticeable sign that there’s algae in your pool is water discoloration. Depending on the kind of algae that is infecting your pool, the color might vary. It could be either blue-black, yellow, or even green. Now, let’s talk about the best methods that can be used for cleaning the algae.

Why does algae spread so quickly?

One of the main reasons why algae spreads so quickly is because it reproduces through its own spores. The spores can be blown in different areas and wherever it finds a suitable spot, it will start to reproduce.

Why does my pool have high pH?

You need to make sure these levels are balanced accordingly, because certain minerals, like calcium, actively work to combat the growth of algae in a swimming pool.

Are algae dangerous in the pool?

Fortunately, there are only three different types of algae that can be found in pools.

How to get rid of algae in the pool?

First of all, you need to scrub the pool. This includes the walls, the algae on the bottom of the pool, and the stairs.

Why is my pool green?

The name comes from the predominant green pigment - chlorophyll. The slimy green algae settle on the pool walls and on the pool floor. The reason for algae growth is usually poor filtration or a lack of disinfectant solution. Typically, green algae are brought into the pool from algae-rich waters through swimwear or toys.

What is the most stubborn algae?

Black algae are the most stubborn species of algae. Their roots dig deep into plaster and concrete surfaces, making them the most difficult algae to remove. From a technical point of view, it is not even algae at all, but cyanobacteria, which multiply quickly and therefore require aggressive treatment.

How long should a circulation pump run?

If the infestation is low, the circulation pump should run continuously for 24 to 48 hours. If the infestation is significant, run the pump for longer than 48 hours.

What is yellow algae?

Because of their color, this type of algae is also known as mustard algae or brown algae. Yellow algae are resistant to chlorine, which makes it difficult to remove .

Why do pools have cover?

In addition, the cover protects the pool from too much sunlight, which in turn promotes the formation of algae.

What Are Algae?

Algae are considered part of the plant kingdom. They’re photosynthetic organisms that use the sun, water and carbon dioxide to make their food. Algae cling to the walls, floor or steps of a pool, or float in the water. They can grow quickly and multiply, so it’s best to treat algae as soon as possible, ideally at first sight.

Preventing Algae Growth in a Pool

Keeping your pool algae-free requires regular maintenance. Below are a few things to consider that will help keep algae at bay.

Getting Rid of Pool Algae

It’s better to prevent algae than to try to get rid of them. However, sometimes algae can creep up on you, developing in a matter of hours or days. The best way to combat algae is to address the issue immediately.

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 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.

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 lower pH in pool?

If the pH is too high, you can either add borates such as ProTeam Supreme Plus as a one-time treatment, or regularly treat your water with acid such as H TH pH Decreaser to lower the pH.

What should the pH level of a pool be?

Your pool should have a pH level between 7.4 and 7.6. If it reaches 8.2 or higher, chlorine becomes mostly inactive. “This is a common problem that can happen with any pool, but is especially common with saltwater pools,” says Goodale.

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.

How much does it cost to test a pool for phosphates?

You can test your pool water for phosphates with a phosphate test strip, about $10, or you can spend about $30 and just go ahead and treat the pool with a phosphate remover chemical. Follow the label instructions carefully to dose correctly, and your algae problems could be over. Many pools that have algae that won’t go away have high phosphate levels (over 300 ppb).

How to stop algae from returning?

Changing the filter media ( sand , de grids or cartridges ) goes a long way to stopping algae from returning. Especially for sand filters, backwashing won’t remove it, and it’s hard to get every trace of microscopic algae cells out of a cartridge pool filter. So, unless you just changed the filter media last year, replace filter sand after several algae treatments. Cartridges and grids (removed from assembly) can be soaked in a 10% bleach to water solution for several hours, and hosed deeply.

Why is my pool water choked with dead plant matter?

For pools that have had repeated algae blooms, several per season for several years, your water is choked with dead plant matter – the skeletal remains of previous algae colonies. But not just that, but if your pool water has not been changed in over 5 years, you probably have a high TDS, a buildup of solids in the water which provides food for algae and shelter from chlorine and sunlight.

What is the purpose of a lowly pool filter?

Consider the lowly pool filter, daily dedicated to pulling out and expelling algae spores. If you have relied on your pool filter to extract algae from your pool water many times in the past, you likely have the cellular remains of previous algae blooms, still harboring in your filter.

What is the best way to hide algae in a pool?

Rough plaster pool surfaces and etched tile grout gives a nice hideaway for algae to hunker down during algae treatment, sacrificing their outer parts to protect the core, the buried root of algae, deep in a tiny crevice.

How to keep algae from coming back in pool?

One more tip: Adding a supplemental sanitizer, like Nature 2 minerals or an Ozonator, is one more way to stop pool algae from coming back.

How many times does algae come back to the pool?

When you can’t get algae to take an extended summer vacation, and green or yellow algae always comes back to your pool, 2, 3 or more times per season , it can seem like a never ending cycle. And it is, until you break the cycle!

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