Got A Green Pool Full Of Floating Plants?

Why Is My Pool Green?

No one wants to swim in a green pool. Unfortunately, it’s very easy for your pool to turn to a swamp seemingly overnight. This can typically be avoided with regular pool maintenance. Usually, a green pool is caused by an overgrowth of algae. If that is the case, the normal treatment would be to kill the algae with a large dose of chlorine. It's a pretty easy fix, and your pool can be clear and blue again in just a few days.

Algae can make a clean pool green, and a lack of chlorine is almost always the cause. However, there are other chemical imbalances that can cause algae growth. In some of those cases, chlorine will not help the situation, no matter how much you pour in. So before you do anything, you’ll have to test the water to see which other chemicals you may need, and in what doses. This article will be focusing only on chlorine shock, so if your chemical tests indicate a different problem, the technique described here will not work.




Item Weight

ProTuff Pool Net - 100% Forever Guarantee Covers ANY Issue - Professional Grade Medium Fine Mesh Pool Skimmer Leaf Catcher Bag Cleans Faster than Other Swimming Pool Cleaners - Nearly 20 inch Rake

Pool Leaf Net - ProTuff

19 x 16 x 1

1.4 pounds

Crystal Pool Brush, Heavy Duty /Quality / Lifetime Guarantee, Modern Attractive Design, Stainless Steel Strong Metal Pool Broom, Easy Push, No Drag Slimline Scrubber, Super Rigid Algae Remover, Molded Bristles, Optimal Bristle Strength/ Lifts Dirt / Hard Wearing / Kind on All Pools Types.

Crystal Pool Brush

18.4 x 6.4 x 2.4

0.9 pounds

Poolmaster 22270 5-Way Test Kit with Case - Premier

Poolmaster 22270 5-Way

4.25 x 7.5 x 4.75

1 pound

Polaris Vac-Sweep 280 Pressure Side Pool Cleaner

Polaris Vac-Sweep 280

20 x 23 x 10

18.1 pounds

In The Swim Chlorine Pool Shock - 24 X 1 lb. bags

In The Swim Chlorine Pool Shock

13 x 10 x 10

24.5 pounds

Natural Chemistry 05131 Pool Perfect+ Phosfree Pool Cleaner 3 Liter

Natural Chemistry Pool Perfect Plus Phos

9.5 x 3 x 4

7.2 pounds

Triluca Pool Skimmer – Fine Mesh Net for Sand, Silt, Pollen, Pet Hair, Leaves & Bugs – Great for Decorative Koi Ponds, Hot Tubs, and Pools

Triluca Pool Skimmer

14 x 1 x 16

0.95 pounds

In The Swim 3 Inch Pool Chlorine Tablets 50 lbs.

In The Swim 3 Inch Pool Clorine Tablets

19 x 14 x 14

50 pounds

Dolphin 99996323 Dolphin Nautilus Robotic Pool Cleaner with Swivel Cable, 60-Feet

Dolphin 99996323 Dolphin Nautilus

20 x 24 x 20

32.5 pounds

Swimline Large Capacity Floating Chlorine Dispenser

Swimline 8720

8 x 8 x 7

0.55 pounds

Buying Guide

If your pool is green, you need the proper tools to fix it up. It’s likely that a lack of proper maintenance has caused your predicament. With the right items you can have your pool glistening and ready for parties in three short days.

First, you’ll want to test the water with a test kit. Make sure your test kit can test for chlorine and pH at least. Other tests, such as Alkalinity and CYA are also useful. You should make sure that your test kit can give you a full spectrum analysis of the state of your water.

After you test to establish the problem, you will most likely have to shock with chlorine. There are different types of chlorine available. Granular chlorine has other chemicals in it, so if you have a nice pH and alkalinity, you may not want to mess them up with granular chlorine. Liquid chlorine tends to be the purest, without other chemicals. The normal liquid chlorine will be watered down, and you may need multiple gallons to shock your pool. There are special formulas with extra strong chlorine solutions for shocking your pool. You’ll need less of them and they tend to be more affordable.

At this point, you’ll want to turn on your filter. It should run at all times during this process. You should backwash the filter frequently.

Let the chlorine sit overnight. The next day, your water should be blue. There will be dead algae all over the place, though, and the water will be cloudy. Proceed to brush the walls and floor to remove stuck algae. Buy a durable brush with curved edges to get into corners.

After brushing, you will have to vacuum the algae that is left sitting around on the bottom of the pool that the filters can’t get to. Manual vacuums are cheaper, but a thorough vacuum takes hours, and you will have to move it yourself. An automatic pool cleaner is highly recommended. It will suck up all the dead algae in a matter of hours.

Lastly, you’ll want to scoop out all the large, free-floating bits of algae, as well as leaves and twigs. Your net should be durable and have a fine mesh, as the algae will be small.

You may need to repeat the whole process once or twice, depending on how green the pool is. Once the shocking is complete, the pool will likely be a bit cloudy from the debris of the algae that the vacuum couldn’t pick up. Keep your filter running 24/7 until the pool is clear and blue.

Make sure to continue a regular chlorination schedule after you fix your pool. It takes only a few days for your pool to become green if you are not adding chlorine daily. The chlorine gets used up fighting organisms and evaporating, so daily injections are necessary.

Different Kinds Of Products

There are a few different tools you will need to tackle this issue. Some are chemicals, while some are manual tools for scrubbing. You’ll need at least one of every category listed below to truly get your pool water blue again.

Testing Kits

Before you do anything, you will want to test your pool water to discover what the issues are. Low levels of chlorine are almost certain to be a problem in a green pool, but there are different chemicals that also need to be monitored. You should check pH levels and alkalinity, as well as other tests offered in such kits.

Kits can come in various forms. Strips are a very popular option. You just dip the strip into the water, and it changes color. Then you compare it with colors on the key, and you can approximate the pH level based on the color. These are simple and fast, but they commonly only test for pH or chlorine. There are other tests that are necessary and can be essential to fixing your green pool.

Other test kits come with test tubes and drops that you mix with the water samples. These commonly test for far more chemicals.

Poolmaster 22270 5-Way Test Kit

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Before you do anything to fix the algae in your pool, you need to test the water. If you don’t test your pool’s water first, and just start throwing chemicals in, you could end up putting in the wrong chemicals. If this happens you will have wasted time and money on pointless chemicals. You could fix the algae issue but create further problems with the water that render it unsafe for swimmers.

The easy fix is the Poolmaster 5-Way Test Kit. It tests for Chlorine, Bromine, pH, Acid Demand and Total Alkalinity. The tests are easy to conduct. You put water in the test tubes, add the appropriate testing chemical and judge the color change against the strips provided. You can test for all five chemicals in a matter of minutes.

Most likely, if you pool is green, you will find that the chlorine levels are incredibly low. Since chlorine is what kills off the organic growth in your pool, a shock followed by a regular chlorine routine should fix your problem. Sometimes, normal chlorine levels aren’t enough, and your pool may require slightly elevated levels depending on where you live.

However, if you levels are elevated and your pool is still green, there is likely another chemical in the pool preventing your chlorine from breaking down the algae. Further tests will be needed to determine the problem.

Chlorine Shock

A normal chlorine level for a pool is between 1.0 and 3.0 ppm. Anything higher and it becomes uncomfortable for swimmers. Anything less, and you’ll have algae growth. However, if your pool is green, the standard level is not going to be enough to kill off all the extra organisms. If your pool is green, you will need to raise the chlorine level temporarily. The proper level will vary based on other chemical levels in your pool, such as pH and CYA. This website provides a quick and easy guide to how high your chlorine levels should be in comparison to other chemicals. It will also tell you how much chlorine to use.

In the Swim Chlorine Pool Shock

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The most important part of algae maintenance is chlorine. You can use another sanitizer if you like, but chlorine is the most popular. In The Swim is an incredibly popular and reputable brand for pool chemicals, and their shock is certain to give you the results you’re looking for.

While you can certainly use large quantities of normal chlorine to shock your pool, it may be more affordable to buy chlorine solutions made specifically for shocking. They contain higher percentages of chlorine, so you can use less in the water. Regular chlorine solutions are often watered down.

In The Swim’s chlorine shock treatment contains high dosages of chlorine in convenient 1-pound bags. They recommend one bag per 10,000 gallons, but that really varies depending on the results of your chlorine tests.

When shocking, put in the chlorine first and wait until the next day. Then you can scrub and vacuum and clean thoroughly. You may want to shock again the next day, or even for a third day, if the pool was especially green.

After your pool returns to a beautiful blue, be sure to keep it that way by treating with normal doses of chlorine every day or your pool will be green again in a matter of days.


​Some of the algae is bound to be stuck fast to the sides and on the bottom of your pool. You will need to scrub it off manually with a brush. You should definitely scrub your pool after shocking. After you shock the pool, it should be clearer and you will be able to see what you’re brushing away better. You’ll probably have to do it more than once.

Before you start scrubbing, you will want to turn your filter on. During the entire process, run your filter 24/7. You should also backwash it often. Brushing the algae off the walls of the pool will leave it floating loose in the water. The filter will be needed to remove the free-floating dead algae. Without your filter, the water will remain cloudy.

Crystal Pool Brush

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This pool brush from CJ Lifestyle is heavy duty and well-designed. The ends of the brush are curved for maximum coverage of corners and edges. The bristles are molded into the plastic frame. The bristles are sturdy enough to really scrub the walls, but gentle enough to avoid scratching the pool surface. The plastic is strong and guaranteed not to break under the pressure of water and scrubbing. The handle is made of a strong, lightweight aluminum alloy. The whole thing is light, to be able to glide swiftly through the water, as the fluid design also reduces water resistance.

A pole is not included, but it fits most standard sized poles.

When shocking your pool, you will have to thoroughly scrub down the whole pool once a day to loosen all the dead algae that the chlorine will kill. You should do this after shocking the pool and before vacuuming. You will add the chlorine shock, wait a day then start scrubbing! Once everything is loose, you can follow up with a vacuum. You’ll probably want to shock again the second day, maybe a third, depending on how green the water is.


While the brush can scrub the algae off, it will simply settle down on the bottom of the pool without a vacuum. You should complete a thorough vacuuming of the entire pool after scrubbing. Then the only algae left will be free-floating algae, and that will be removed by the filter.

Some people prefer a manual vacuum, which can be more thorough, and it’s easier to focus on specific places in the pool that are especially dirty. There are also automatic vacuums that run on their own and need little guidance or assistance. It is your preference which you use, but you definitely need one. Without it, all the algae will sit on the bottom of your pool and never get sucked up by your filter.

Polaris Vac-Sweep 280 Pressure Side Pool Cleaner

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The Polaris Vac-Sweep is one of the most popular pool vacuums available today. It works in all in-ground pools with the booster pump. It has stronger suction due to dual jets. It is especially adept at picking up large debris as well as small. It stores everything in a single chamber filter bag that is easy to change and affordable to replace.

Due to its double jets, it can clean a pool very quickly. It typically finishes in three hours or less. The hose included is 31 feet long, so it should be enough to reach all the nooks and crannies in your pool.

The Polaris is well-built and durable. It should stay in your family for years to come, and is certain to reduce the amount of time you spend cleaning your pool. Just turn it on and let it do the rest.

When setting the Polaris to vacuum the dead algae that will gather after a pool shock, make sure to monitor the bag. There will be a lot of debris and waste, and the bag will fill up faster than usual. You should vacuum after scrubbing. You can certainly scoop out the pool with the net bag while the Polaris vacuums.


You will also want to regularly remove leaves and large chunks of free floating algae with a skimmer net. This will take some of the burden off your filter, and clean the pool faster.

​Make sure to buy a net that is sturdy, but with thin mesh. This will allow it to pick up smaller particles, not just leaves and twigs. It needs to have a long enough pole to reach to the other end of the pool. You should skim at least once a day while shocking your pool.

​Pool Leaf Net – ProTuff

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​The ProTuff leaf net is one of the best leaf nets on the market. The mesh is super thin, so it can pick up even the smallest particles with ease. The construction is sturdy, so it won’t fall apart, even after years of use. ProTuff is so confident in their construction that they include a 100% lifetime money-back guarantee protecting against breakage and tears.

​The net is made of a durable double-stitched nylon. It is abrasion-resistant and tapered for easy moving through the water. The frame is made of a tough aluminum alloy. It won’t bend or rust. The rim is made of plastic, so it won’t scratch up your pool walls. The plastic is strong and durable. It is also built with a scoop on the front for picking up debris on the bottom of the pool. The sides are angled for scooping up rubbish against the walls. A pole is not included, but it fits most standard poles.

Make sure to scoop debris from your pool at least once a day when shocking your pool. It can be the last step you do, after shocking, brushing and vacuuming.

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If you find yourself facing the common “My pool is green” problem, don’t fret. It is easy to fix in a few days and with a little bit of labor. Just test the water for what chemicals are lacking then shock with chlorine. After a night, scrub out the dead algae. Repeat for as many days as necessary until there’s no more algae growing and the pool is clear and blue. Happy swimming!

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