Black Algae in Pool

Black spot algae in pool

Don’t drain your pool to remove black spot algae because it will simply come back again. Draining the pool is not effective because the algae also live in the pipework, solar heaters, filter and pump. This means that once the pool is acid-washed and refilled, the algae in your pool equipment will be reintroduced back into the pool and start spreading again. We have removed black spot from dozens of pools that have already been acid-washed just a few months earlier!

Before After Swimming Pool Chlorinegreen algae after
Copper stains 3
Copper Stains in Swimming Pools The Pool Stain Removers 1

Algae is one of the most frequent issues pool owners face.

Thankfully, with our treatments, the problem can be fixed easily and quickly without draining the pool water. Our long-lasting treatments also help prevent it from coming back.

Our products will completely wipe out many forms of algae and bacteria that normal chlorine levels cannot. In most cases, our quality algaecides will clear your green pool water within 48 hours and completely remove black spot, green algae and mustard algae within a few weeks.

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Signs of Black Spot algae

Black Spot algae

Factors that encourage Black Spot

Pool black spot remover

The trick to effective algae removal is using quality products that are strong enough to do the job properly. All cheap algaecides are diluted (watered down) and will not kill strong algae growth. These products are cheap because you’re simply paying for colored water, not the expensive active ingredients that do the hard work. Our products have no water or coloring added to reduce algae killing strength.

We strongly suggest that you act on black spot algae as soon as possible. If black spot stains are left for longer than 2-3 years, the algae roots can sometimes penetrate the concrete pool interior and discolor it permanently.

black spot algae
Algae stains
black algae
stain from magnapool salt
black spot algae
black spot algae in pool
black spot algae

Causes of black spot algae in pool surfaces

There are two main factors that lead to algae growth – high phosphate levels and/or poor chlorination. Phosphates are believed to be the main cause behind algae growth as they form part of the ‘food’ that algae need to survive. Most pool experts agree that if phosphates are removed from the water, algae will struggle to survive.

On the other hand, it is not true to say that algae will grow if there are low phosphate levels present in the water. For example, properly balanced, filtered and chlorinated water will not allow algae growth, even if low levels of phosphates are present in the water. Therefore, it is not necessary to constantly add expensive products to remove small amounts of phosphates. Remember, phosphate levels just need to be kept low with your water balanced and chlorinated properly.


Remove black algae in pool without draining

Most Black Spot and mustard algae can be completely removed using our treatments on any pool finish including Pebblecrete, Quartz, fiberglass, glass bead or fully tiled pools.  As the images show, we can remove Black Spot and other algae stains from swimming pool surfaces without draining the pool water.  Best of all, we can keep it gone.

If you are unsure of the type of stain you have please feel free to speak with us.

Please call us if you are unsure of the type of staining you have as the wrong treatment can make it much worse. This image is of a pool that initially had mild metal staining. Our customer believed that the metal stains were black spot algae. He then treated it with granular chlorine to remove the stains and within an hour the pool surface was black. Treating a metal stain with chlorine and algaecides will oxidise them and turn them black.

Black Spot Stain Removal

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Black Spot Stain Removal DIY kit

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Black Spot Stain Removal –
On Site Technician

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Remove copper and metals from pool water

CuLator Metal Eliminator removes copper and most other metals from pool water. This helps to prevent metal stains from appearing in your pool later on. Algaecides may contain a copper complex that should be removed a few months after treatment. CuLator Metal Eliminator is unique because it can physically remove copper and other metals from pool water. Your pool shop will help you to measure the copper levels in your pool water. Click here for more information about CuLator Metal Eliminator.

Culator Metal Eliminator

Types of Algae Found in Swimming Pools

Green algae is the most common and fastest-growing algae types found in swimming pools.  It will often turn your pool water green or cloudy overnight!   It most commonly starts in corners or areas where automatic pool cleaners are unable to access, such as steps. Furthermore, low chlorine levels, warm temperatures and very high phosphates are the perfect combinations for algae growth.  We can remove green algae in less than 48 hours and keep it gone.

Mustard Algae is usually easy to brush off the walls and floor of your pool, but it will often quickly return. It grows in shady areas of the pool which are protected from sunlight or areas of poor circulation. So just like black spot, yellow algae is somewhat resistant to normal chlorine levels.  Our treatment will remove mustard algae in less than 72 hours.

Black spot algae in pool surfaces are unique because it grows in the walls or floor of your pool, often in areas with low circulation and will not brush away like other algae. This algae type spreads slowly and is often mistaken for mold because it forms dark spots on the pool surface.  Consequently, we suggest that you act on this type of algae quickly as its roots (algal spores) can penetrate into the pool cement and cause permanent damage and discolouration to your pool interior if it is not treated quickly. Black algae in pool surfaces form a protective layer that makes it resistant to chlorine.  Our quality process and products will remove black spot within a few weeks.  Also, some pool shops mistakenly believe that black spot can NEVER be completely removed.  Remember, black spot CAN be removed and we do it regularly.  Pool shops will sometimes insist on acid washing for black spot because it is a great money-spinner for their business. IMPORTANT NOTE: YOU DO NOT NEED TO DRAIN YOUR POOL TO REMOVE BLACK ALGAE IN POOL SURFACES.

If you have black spots in a fiberglass pool please contact us for further information.

Unlike other forms of algae, pink slime is actually a bacteria, not algae.  It often appears around skimmer boxes, lights, ladders and other areas of the pool. If not treated promptly, it will continue to slowly spread around the walls and floor of your pool.  We are able to remove pink slime algae for you.   It is not very common in America.