How do I remove Green Algae from my patio?

Green Algae growth on outdoor surfaces is a problem for homeowners throughout the UK. Find out here all you need to know about green algae, why you have it on your patio, how to remove it, and how to prevent it returning

Why do I have green algae on my patio?

Green Algae will normally form on areas of your patio where light is restricted.  Under the shadow of trees where rainwater lingers is the perfect setting for green algae to thrive.

Affected surfaces become slimy when wet. This causes a slip hazard where accidents can potentially happen. If algae is left to dry over the summer it will turn black and make the patio look dark and dirty, providing ideal conditions for the process to begin again the following winter.

In damp but mild conditions (hello UK!) green algae can be prolific!


How do I remove Green Algae from my patio?

Available methods of algae removal:

  1. Power washing: this will remove the algae but may also damage the patio surface and grout creating more work.
  2. The easy solution is to apply a proprietary  algae remover / inhibitor.


Choose your algae remover carefully as there are many products available that are simply derivatives of bleach. These will remove the colour of the algae but not remove the problem. Solve the problem correctly with an effective spray on algae killer.

Rob Parkers BestAlgae Remover and Patio Reviver will kill green algae.  This treatment will kill and remove the green slimey stains, restoring your patio.

How can I stop green algae from growing on my patio?

Using a specific algal killer such as Rob Parkers Best Algae Remover and Patio Reviver, will not only kill the green algae that are present; it also provides residual protection to the paving for up to 12 months preventing further algal growth.


The product works gradually. Over a period of days daily improvement can be seen in the stone surface.  The formulation works in conjunction with atmospheric conditions (sun, rain and air temperature) giving ongoing protection against further build-up of green algae throughout the season.

Furthermore, if the product is applied every year, at the same time, the problem can be permanently solved.

Use Rob Parkers Best Algae Remover & Patio Reviver as a Preventative Treatment

At Stoneworld we apply Rob Parkers Best Algae Remover and Patio Reviver to our paved areas every September as a preventative measure. When the weather begins to turn damper and cooler at the beginning of Autumn, green algae can take over. Protect your patio against growth through the winter rather than allowing algae to grow and then killing the algae once you have it.


How do I apply Rob Parkers Best Algae Remover & Patio Reviver?

Using our product is easy!

Simply spray onto affected surfaces using a garden sprayer.

The product is sold in small 250ml bottles that we ask you to dilute with 4 litres of water before use. This makes enough to cover 25 square metres.  By selling the product in a concentrated format we can save on packaging – one way that Stoneworld can help to save the planet.  So many companies sell diluted products in large wasteful containers – we are trying to get away from that in the future. We are sure you won’t mind diluting the product at home when you think about the reasoning behind it.

At Stoneworld we recommend Rob Parkers Best Products for many care and maintenance jobs on stone surfaces.  We have developed the range in conjunction with scientists to ensure good results can be achieved, offering stone owners TOTAL STONE CARE.  Check out the full range here>>

Buy Rob Parkers Best Algae Remover & Patio Reviver>>

8 thoughts on “How do I remove Green Algae from my patio?

  • 15th June 2020 at 5:47 pm

    Good afternoon,

    I have black spot on my patio. I have read all the information on your product. I have an ornate pool near the patio. It is in the ground and about 900 gallons. Is your product harmful to the fish? The patio is Karcher cleaned twice a year.


    • 18th June 2020 at 10:59 am

      This product is harmful to aquatic life

  • 29th August 2020 at 4:14 pm

    I have read the information above. My green algae is not removable by pressure washing, does that mean that your product won’t work either. There is significant staining on my limestone patio.


    • 24th September 2020 at 10:23 am

      The Green Algae needs to be killed. Our product works on the algae over a number of months. You don’t wash it away. View our video to see how the example changes over a number of days. Longlasting action

  • 18th September 2020 at 11:42 am

    I’m new to this and really need to set up my home . Looks like I’ll be grabbing this info. Thank you!

  • 25th October 2020 at 1:35 pm

    Can this product be used on porcelain outdoor patio slabs?

    • 26th October 2020 at 2:23 pm

      Yes, this product can be used on exterior porcelain paving, plus many other materials, such as stone, wood, and garden furniture


Leave a Reply

Your email address will not be published. Required fields are marked *