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How to deal with Black Algae in your Pool : The Complete Guide

What to do if you have Black Algae in your Pool 

Black algae is a living organism that is often found in outdoor swimming pools. Specifically swimming pools that have porous floors and walls. They grow mainly in warm pools on corners, steps and other difficult to reach areas. When swimming pools have high pH levels and low chlorine levels, black algae is more likely to grow. In this article you will learn more about black algae, how eliminate it, how to prevent it and why it is bad for your swimming pool. 

black algae

How to Identify Black Algae 

If you notice anything that looks like black algae, you should make sure it is exactly that. This will allow you to identify the best and most appropriate way to treat it. Here are just a few things you should look out for when trying to identify whether or not black algae is growing in your swimming pool. 

  • They should look like black or blue/green textured spots 
  • You should mainly see black algae in areas that are rough or textured. Mainly in corners, edges or steps 
  • Difficult to remove, try to wipe or scrape it off, it won’t come off with ease  It can still grow in pools with adequate filtration systems 

Prevent Black Algae From Growing in The First Place 
The best thing you can do is prevent black algae from growing in the first place. There are a few preventative measures that you can take to inhibit the growth of black algae. Here are some of the things you can do to prevent black algae from growing: 
Clean Swimming Costumes That Have Been in The Ocean Thoroughly 

Most people don’t realise that swimming costumes that have been in the ocean can introduce black algae to swimming pools. Therefore, if you or anyone who will be swimming in your pool swims in the ocean, make sure they wash and dry their swimming costume properly before using it to swim in your pool. Spores attach themselves to the swimming suit fabric and can jump off the minute they get into another body of water. 

  • Check The Chemical Levels Often 

Make sure your pool has the proper chemical levels, check often to ensure that your pool is safe and clean,

  • Turn The Pump and Filter On 

Switch your pump and filter on to remove spores, you should aim for about 7 to 10 hours per day. 

  • Brush and Clean Your Pool Often 

Brush the walls and sides of the pool on a weekly basis to get rid of spores and to keep it clean generally. A dirty pool is a breeding ground for black algae. 

Keep Pool Equipment Clean and Sanitized 

Keeping pool equipment clean and sanitized is crucial. There is no point keeping your pool sparkling clean if the pool equipment is not sparkling clean and germ free too. Because the second you place the unclean equipment into the pool, you introduce new germs, dirt and debris into the pool. Clean your pool equipment properly after each use. 

Shock The Pool on a Weekly Basis 

Shock your pool weekly by adding a large amount of chlorine to your swimming pool water. What this does is completely shocks the unwanted guests in the pool water. For example, if there are spores in the pool water, shocking the pool should kill them before they begin to grow or populate. 

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How To Get Rid of Black Algae 

If you do have black algae in your pool water, chances are you want to get rid of it right? Well, no need to panic,  you can eliminate it by following these steps. It will take some time to remove it but it will be worth it in the end. 


What Do You Need to Get Rid of Black Algae in Your Swimming Pool? 

Follow these 11 simple steps to eradicate black algae from your swimming pool. Remember this, prevention is better than cure so if you work regularly to prevent, you won’t have to constantly keep going through steps to get rid of the black algae. Pay attention to your pool and be sure to clean it regularly and test its pH levels and chlorine levels. Anyway, let’s get into the 11 steps to remove black algae from your swimming pool. 
 Clean and Disinfect Your Tools 
Before you even start doing anything to get rid of the black algae, clean and remove bacteria from the equipment that you are going to use during the process. This is important, introducing more bacteria to the pool whilst cleaning will just simply make things worse. Clean your equipment with a chlorine solution before you start. 
Wash the Filters 
Washing your filters is a vital step, you will need to do this because if there is algae in your swimming pool, there will certainly be some black algae in your filters. This is why I must clean them. One important thing to bear in mind is that if you have a sand or DE filter, you must go through the process of backwashing and rinsing a few times before you move on to the next steps. 
Scrub, Scrub and Scrub Some More 

Utilize the nylon brush to clean the bottom and sides of your swimming pool. This will take some time but it will certainly be worth it in the end. 
Prior to commencing the scrubbing process, it might be a good idea to check to see if it really is black algae. It probably is if your pool is a porous surface pool. For example, if your pool is made from cement or natural materials, it is more than likely that it is black algae. With natural material pools, a good quality wire brush will be best to eradicate the initial layers of black algae. 

Use Chlorine Tablets To Scrub

Use chlorine tablets to scrub the areas where the algae is growing. Break the tablets down and use them as an abrasive powder to break down the rest of the algae. 
Shock The Pool 
Shock the pool by using a good quality pool shocking treatment. Such as a powerful chlorine shock solution, this will wipe out any bacteria overgrowth. Read the instructions on the packaging however, 30 parts per million is a good place to start in terms of the recommended measurements for shocking a swimming pool. 

Use Granulated Chlorine 
Pour granulated chlorine into the pool, focus on the areas where you scrubbed the black algae. This step might not be appropriate if you have a dark coloured surface pool. 
Use Algaecide 

Use algaecide to kill and prevent more black algae growth. It is a powerful chemical that can be used to get rid of, a large bottle of algaecide can be used to manage an algae problem in 15,000 gallons of water. Be sure to do this as adding algaecide to your swimming pool water is a very important step in preventing black algae growth in your swimming pool. 
Switch Your Pump on 

A day after undertaking the treatment, turn your pump on and leave it on for another full day. Then run it for about 10 hours a day after that for the next few days. 

Brush, Brush and Brush Some More 

For the next few days, keep brushing and cleaning the pool, do it daily for about a week then three to four times a week thereafter. Brushing your pool often can keep spores at bay and also remove excess dirt and debris from your swimming pool. 
Wash Your Filter 

Clean your filter when you have finished doing the treatment. There will surely be some particles left behind, so remember to thoroughly clean your filter. If you have a sand filter or a DE filter, remember to backwash and clean with fresh water, try and do this backwash process a couple of times a month if you can. 
Monitor the Situation and Keep Checking 

The best way of preventing black algae formation is to keep monitoring the situation, continue to check and test the water. Do this on a regular basis and this will help to prevent the overgrowth of bacteria in your swimming pool which could eventually contribute to black algae growth. 

To Conclude 

One of the most important things you could possibly do for your swimming pool is to perform regular maintenance. If you fail to do this, you will face problems like unbalanced pH levels, low chlorine levels and overgrowth of black algae and other problems. Prevention is truly much better than cure therefore, you should be cleaning your pool every few days, checking and testing water and keeping an eye out for any dirt or debris that could have an adverse effect on your swimming pool. Check phosphate levels too and clean spores from the pool whenever you get the chance to. Don’t wait until you have a severe outbreak before you start regularly cleaning your swimming pool. Also, if necessary call in the professionals when you are in doubt.

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