Identify Treat and Remove Algae in Your Swimming Pool

If you have a swimming pool, you probably know that July and August are some of the worst months for the pool. This is because, the months are sunny and warm and this promotes the growth of algae in the pool. In addition, the warmth brings inconsistencies on the sanitizer levels in the pool and this compounds the problem of the algae.

Algae are single cell plant that utilizes the process of photosynthesis to manufacture food.  The problem with algae is that it comes in many different forms and colours and this enables it to adapt to varying environmental conditions. And since this plant is microscopic in size, you are not able to notice it until it has infested your pool in the millions. By the time the situation reaches there, it is too late and expensive to correct the situation.

Prevention is always the best option

When it comes to pool algae, prevention is always the best option. It is advisable to ensure that your pool has all the necessary chemicals needed to keep it clean and natural. Alternatively, you can opt for salt water chlorinated pools that are more resistant to the growth of the algae. Below, we will look at the different types of pool algae and how to remove them.

Green algae

Green algae is the most common algae in today’s pools. It either clings on the walls or float on the water. The algae can either appear as dark-green, blue-green or yellow-green. That is why pools infected with algae have a hazy green appearance.

The good thing however is that, you can treat these algae through shocking, brushing and the use of the right algaecide. To begin the treatment process, you need to ensure that the water is in the correct ph level. And if necessary, balance out the water chemistry.


If you treat your pool with chlorine, you should have it thoroughly brushed and shocked. This raises the chlorine level to 3ppm. When done, add a heavy dose of algaecide 60 into your pool. Also, ensure that your pool has a good circulation system in order to spread the chemical thoroughly.

To completely eradicate the algae, repeat this process several times.

Black algae

Black algae are the black-green type of pool algae that normally forms on cracks and crevices around the pool. This alga is mostly found on pools with plaster and concrete surfaces on it. In addition, you will find that the algae prefer shady areas around the pool.  However, it is important to note that black algae have a slimy layer that is impervious to the normal level of chlorine. On the other hand, the algae will not change the look of your pool but to the contrary, form some black spots on the surface.


Just like in the green algae, the treatment for black algae begins with proper balancing of the water chemistry. However, you have to brush over the algae in order to break through its slimy layer.  If you don’t break through this layer, the treatment will not work. To completely rid your pool of the algae, shock it thoroughly before adding high amounts of algaecide in the water.

Mustard algae

Mustard algae are normally yellow-green to brown in colour and are very resistant to chlorine. This alga appears like sand and occurs either at the bottom or side of the pool.


In the treatment, follow the same procedure as that of treating black algae.


If your pool has large amounts of algae, you may need to vacuum out the pool.  In this process, you will have to brush out the algae from the walls before adding a ‘floc’ that helps settle the algae at the bottom of the pool.  When all algae have settled, vacuum it out of the pool in the normal way.

As a long term measure in preventing algae from growing in your pool, you should consider installing salt chorine generators. These appliances release a consistent stream of natural chlorine into the water thereby preventing the growth of the pool algae. One advantage of having this system in your pool is that, you can leave your home for weeks without the worry of finding algae in the pool upon your return. Secondly, the system significantly reduces labor and pool cleaning needs.

As strange as it sounds, proper pool maintenance can prevent the growth of algae thereby enabling you to enjoy crystal clear pool water for years. To make things easier, you can cut down on the amount of labor involved by installing an automatic salt chlorinator. This equipment will do the chlorination work on your behalf.

If you have an Algae problems our sister company Pool Geeks will help you get rid of it.