Reasons Why Green Algae Keep Coming Back. How to Get Rid of Them Permanently?

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Green algae is a growing problem in pools, and there are many reasons why it occurs. Despite what you may think, green algae can be difficult to get rid of because it doesn’t just come out of nowhere. There are several factors that lead to green algae problems in your pool. In this article, you will learn what these factors are. So, keep reading!

Reasons why green algae keep coming back

Issues with the water balance

Green algae can be the cause of a problem with the water balance. If your pool is not properly filtered and circulated, green algae will grow in it. You may not see this at first, but over time you will notice that your pool has become cloudy or hazy. This is especially prominent after rain or snow melts off during winter months.

Inadequate filtering times

Green algae is a common problem in pools, especially when there is not enough filtering time. This can be caused by inadequate filtration times and poor lighting. If you use a pool vacuum or pool brush to clean the water regularly, consider increasing the number of cycles per day. This way, the filter has more time to remove bacteria and other contaminants from your pool.

Improper water circulation in your pool

Green algae can also be caused by inadequate water circulation in your fibreglass pools rockhampton. If you have a low-volume pump or filter, it may not be able to keep up with the speed of the water as it flows through your pool. You can check this by turning off all pumps and filters, and then pouring some food colouring into a bucket of clear tap water.

If you have a pool with poor circulation, your pump and skimmer will not be able to remove all of the waste from your pool. This can lead to a buildup of sediment in your filter or skimmer basket. This will cause excess nutrients that feed algae growth as well as other contaminants such as dirt particles and organic matter (eumycetes).

To improve your pool’s circulation further, try installing an automatic return system where each end is connected directly to an outlet pipe that runs into your house’s plumbing system.

As long as there is adequate filtration on both sides of this equation—i.e., no standing water—you shouldn’t have any problem getting rid of this type of algae issue!

Low chlorine levels

If you’ve ever experienced green algae in your pool, it’s likely that the culprit was low chlorine levels. Green algae can also be caused by chlorine shock treatment.

To test for the presence of chloramines in your pool water, take a sample from a pump filter or skimmer (make sure it’s not too dirty). You should have at least 24 hours before taking this sample because any contaminants will need time to break down and be filtered out by filtration equipment.

How to get rid of green algae

Vacuum your pool manually

Green algae can be an unsightly problem, but it’s not necessarily a cause for alarm. If you notice green stains on the walls or floor of your pool and want to get rid of them, there are several ways to do so:

  • Use a pool brush to scrub the walls and floor of your pool weekly. This will help clear out any debris that may have accumulated in those areas over time (it also helps keep things clean).
  • Ensure you use a vacuum with a long enough hose that reaches all areas of your pool. This way, you won’t miss any small spots where algae might be growing back after cleaning efforts were made.

Brush your pool walls and floor

At times, green algae can appear on your pool walls and floors. To keep these areas clear of algae, use a scrub brush to remove the debris that accumulates over time. A soft bristle pool brush is ideal for this task because it has bristles that are designed to be gentle on your pool surface without scratching it or damaging it in any way.

Balance the water

To test the water for chlorine levels, you can use a home testing kit. You can also use a simple test kit at your local pool store or pool supply store.

To test the pH level of your pool water, you’ll need to know how much buffering capacity there is in order to calculate how acidic or basic it is. This will help determine whether one type of algae might grow better than another if you have too much acidity in your pool’s water (or vice versa).

Total alkalinity (TA) measures how well minerals are present in the solution. This includes calcium hardness (CH), total dissolved solids (TDS), cyanuric acid levels and even some trace elements like iron or manganese.

Shock your pool

You can use a shock treatment to kill the green algae. This is a very effective way to get rid of your algae, but it’s also important that you follow all of the instructions that come with your shock treatment. You don’t want to do anything wrong when using this method, as it can be dangerous for swimmers and pool owners alike!

To shock your swimming pool, you will need to purchase one from your local pool supply store or online retailer. However, make sure that you read through all of their instructions before purchasing any given product so that you know exactly how they work best. Make sure that there are no other chemicals in the water (like chlorine) when using this method. If you don’t, no good will come out of doing so!


Green algae can be a problem, but it doesn’t have to be. As you can see, there are many different reasons why green algae come back into your pool. If you want to avoid this problem, then use these tips on how to get rid of green algae once and for all. You should also keep an eye out for any signs that could indicate another problem so that you know when it’s time to call in professionals.