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Organic Pool Stain Removal – What Is It?

Getting stains in your fibreglass pool is unavoidable. If you do see stains forming in your pool, then this could end up making you feel disheartened. A fibreglass pool is a large investment, and you would want to ensure that your pool stays stain free and clean.

If you do find stains developing in your pool, then there are several things that you can do. The first of these is identifying what kind of stain is affecting your pool. There are two kinds of pool stains that you could find yourself dealing with. The first of these are organic pool stains, and the second is metal pool stains. This guide covers organic pool stains.

How Can You Identify An Organic Pool Stain?

How you go about treating an organic pool stain is very different from how you would treat a metal pool stain. Natural elements can cause stains to be formed in the pool water – these are called organic pool stains. You can even find algae or even mud causing stains to form in your pool.

Metal pool stains, on the other hand, tend to be darker. They often are coloured reddish-brown as well. This is why the colour of the stain can go a long way in helping you tell organic pool stains apart from metal ones. It’s generally easier to remove organic pool stains from your pool when compared to metal pool stains.

There’s a simple test that you can do, to determine what kind of stain is affecting your pool. Take a little granular chlorine and add it on top of the pool stain. Use a brush to gradually scrub the chlorine granules into the stain. In case the stain disappears, then it was likely organic. Should the stain remain unchanged, then you’re probably dealing with a metal pool stain.

How Can You Get Rid Of Organic Pool Stains?

It’s easier to remove organic stains from your pool than metallic ones. Organic pool stains also don’t pose any kind of threat to the integrity of your fibreglass pool. These stains are a result of natural causes and can be gotten rid of in just a few simple steps.

1. Getting Rid Of Leaves And Debris

The first thing you need to do is get rid of any foreign contaminants that might be present in your pool. If you find leaves, twigs, branches, and other such contaminants in your pool, then these will need to be removed. Otherwise, they can cause stains to form.

All you need is a simple skimmer net to get rid of these contaminants. Remember to run your pool filter as well, to get rid of the smaller contaminants in the pool water.

2. Testing The Water

Next, you’ll need to test the water to find out whether it’s properly balanced or not. The level of chlorine in the pool water should be less than 1.0 ppm. To make this happen, you’ll need to use a chlorine neutralizer. You could alternatively choose not to use a sanitiser in your pool for a couple of days.

3. Shocking The Pool Water

Next, you’ll need to shock the water in your fibreglass pool. For this process, you’re adding chemicals to the pool water in order to break the combined chlorine in the pool apart. This helps you to raise the level of chlorine in the pool water.

Essentially, pool shock is a kind of granular oxidizer. This means that it’s chlorine in the form of a powder. When you are dealing with organic pool stains, you want to ensure that the bacteria in your pool water are killed. If there are other organic matter in your pool, then these will be killed as well. This is why shocking the water of your pool can help remove the stains faster, as the bacteria in the pool will be purged.

Remember that you should always add pool shock directly to the water of the pool. You shouldn’t mix the pool shock with anything except water, as this could cause the pool shock to react. You should also consider shocking your pool at night. This is because, during the day, UV rays from the Sun can end up dissolving the chlorine you add to the pool.

4. Brushing The Stains

Now that you’ve shocked the water in your fibreglass pool, the next step involves using a brush to clean spots and stains that are present in the pool. At this point, it should be easy to scrub away the stains.

5. Running The Pool Pump

After you’ve scrubbed the stains away, these stains will have likely dissolved back into the water of your fibreglass pool. This is why you should turn on the pool pump at this point. This allows you to filter out dirty water that’s present in your pool water after scrubbing the organic pool stains.

You should run your pool pump for at least eight hours, to ensure that it effectively cleans the water in your pool.

6. Brushing The Pool Again

Even after you’ve brushed your fibreglass pool once, there are chances that there could still be some stains left behind. Stains that are stubborn can be harder to get rid of. If you still see stains in your pool water, then it’s time to brush your pool again.

This way, you can ensure that the stains are removed completely.

7. Monitor The Stains

Finally, carefully check your pool to ensure that all the stains have disappeared. It’s possible that you could still find some organic pool stains in your pool. If this is the case, then you’ll need to repeat all the steps mentioned in this guide, to ensure that all organic pool stains are effectively removed.


Organic pool stains are caused by algae, bacteria, and other organic matter that might be creeping around in your pool. If you notice an organic pool stain, then get rid of it as soon as possible to prevent the stain from spreading or getting worse. This guide helps you learn all about how you can get rid of organic pool stains. If you want to learn more, you can visit website. We provide weekly content on how to maintain your pool, as well as how to spruce up the area around it for entertaining!

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