Algae stains in swimming pools

Algae stains in pools and green algae are not the same thing.  When you remove algae from your swimming pool, often stubborn algae staining may still be visible on the pool surface.  This green or brown staining looks similar to green algae but it will not brush away, respond to shock chlorination, or even large doses of algaecides and chlorine. So, in these cases, our algae stain treatment process is required to remove this green discolouration from the surface.

We have developed a treatment solution, along with our high strength proprietary compounds, that dissolves 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.  Above all, the good news is that if the pool water is maintained correctly 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.

Examples of algae stains in swimming pools

algae stains on fibreglass
algae stains on fibreglass
green algae staining before
green algae after

Our client in North Queensland 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 colour 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 have made.

Katrina in Melbourne has a glass bead pool with crystal clear water but with very bad algae staining. She was sceptical about products that claimed to remove heavy staining without draining the water. To her delight, the stains have gone and the pool is looking great. She sent these images that show the dramatic change in her pool after our treatment.

OPTION 1 – Algae Stain Removal DIY kit

What We Do 1


pool stain removal


pool stain removal



  • 1 Litre of powerful algae stain prevention formula
  • 4 Kgs 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 delivered and tracked by Fastway Couriers
  • Kids are back in the pool in just 7 days
  • Kit is $295 for pools 40,000+ Litres


Enquire now!

OPTION 2 – Algae Stain Removal – On Site Technician


pool stain removal


pool stain removal



  • 1 Litre of powerful algae stain prevention formula
  • 4 Kgs 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 $465 for pools 40,000+ Litres


Enquire now!

Types of algae in swimming pools


  • Green algae are the most common cause of algae stains in swimming pools.  Basically, this is because green algae are one of the fastest-growing algae types and will often turn your pool green or cloudy overnight!   Also, green algae most commonly start 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 are unique in that it grows in spots on the walls or floor of your pool, often in areas with low circulation. Also, it spreads slowly and is often mistaken for mould 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 severe damage and discolouration to your pool interior if it is not treated quickly. In addition, the black spot forms a protective surface layer (biofilm) that protects it from chlorine. However, some pool shops mistakenly believe that black spot can NEVER be completely removed.  Also, pool shops 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 fibreglass 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 Australia. However, if you would like to know more about it then this page from the USA may be worth reading.