Algae stains in swimming pools

Algae stains in pools and green algae are not the same thing.  When algae has been present in your swimming pool, often stubborn green algae staining may still be visible on the pool surface, even after the living algae has gone.  This green staining looks similar to green algae, but it will not brush away, respond to shock chlorination or even large doses of algaecides. In these cases, you will need out algae stain treatment process to remove this green discoloration from the surface. In science, this staining is sometimes referred to as calcium phosphate scale.  This is greeny brown in color and does not respond to chlorine, scrubbing, or algaecides.

Our polymer liquid solution, along with our high strength compounds, dissolves these stains, leaving your pool surface clean once again. Remember, you don’t need to drain, water blast or acid wash your pool to remove this staining.  You can remove these stains with the water still in your pool.  Best of all, if you maintain the pool water afterward then the staining will be permanently removed, and your pool will look like new once again.

Finally, the images below show that we are able to successfully remove this staining from almost every pool.  So contact us today if you have algae staining in your pool.

Algae staining
This customer had perfectly clear pool water but a very heavy green stain on the surface. It was driving him crazy. Thinking it was green algae he treated it again and again only to see no changes at all. Our algae stain remover fixed the pool in less than 2 weeks.

Examples of algae stains in swimming pools

Our client had purchased a home with a very old and badly stained pool.  The treatment we sent her removed almost all of the staining and completely changed the color of the pool surface.  So even though it is not perfect (because of the age of the interior), she is delighted with the difference our treatments made to her pool.

Our client had spent over $250.00 on algaecide and other products to remove what they thought was green algae from the pool tiles.  After adding our treatments, the staining was gone completely within 24 hours.  He sent us these images to show the difference in the surface.

algae stains on fibreglass
algae stains on fibreglass
algae stains on tiles
algae stains on tiles after

OPTION 1 – Algae Stain Removal DIY kit

What We Do 1


pool stain removal


pool stain removal



  • 1 bottle (32oz) of powerful algae stain removal formula
  • 9 lbs of our algae stain dissolving compound
  • Phone support from our technicians
  • Simple step-by-step instructions included
  • Pool does NOT need to be drained
  • Kit shipped and tracked by Fedex
  • Kids are back in the pool in just 7 days
  • Kit is $295 for pools 10,000 gallons


Enquire now!

OPTION 2 – Algae Stain Removal – On Site Technician


pool stain removal


pool stain removal



  • 1 bottle (32oz) powerful algae stain removal formula
  • 9 lbs of our algae stain dissolving compound
  • The pool does NOT need to be drained
  • Complete 7 point on site water testing
  • Kids are back in the pool in 7 days
  • Visit is $405 for pools 10,000 gallons


Enquire now!

Types of algae found in swimming pools


  • Green algae is the most common cause of algae stains in swimming pools.  Basically, this is because green algae is one of the fastest-growing algae types and will often turn your pool green or cloudy overnight!   Also, green algae most commonly starts in corners or areas where automatic pool cleaners are unable to access.  Green algae can also occur in areas where circulation is poor or restricted (such as steps).  Furthermore, low chlorine levels, warm temperatures and very high phosphates are the perfect combinations for algae growth.  We can remove algae stains in pools in less than 48 hours and keep them gone.


  • ​This type of 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. 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 is unique in that it grows in spots on the walls or floor of your pool, often in areas with low circulation. In particular, it spreads slowly and is often mistaken for mold because it forms spots on the surface of your pool.  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 discoloration to your pool interior if it is not treated quickly. In addition, black spot forms a protective surface layer that makes it resistant to chlorine. However, some pool stores mistakenly believe that black spot can NEVER be completely removed.  So they will sometimes insist on acid washing for black spot because it is a great money-spinner for their business. It CAN be removed and we do it almost every day! Remember, YOU DO NOT NEED TO DRAIN YOUR POOL TO REMOVE BLACK SPOT.
  • 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.  Therefore, it often appears around skimmer boxes, lights, ladders and other areas of the pool.  So if you do not treat it promptly, it will continue to slowly spread around the walls and floor of your pool.  Remember, we are able to remove pink slime algae for you. In fact, pink slime is not very common in the USA. However, if you would like to know more about it then this page may be worth reading.