10 bestMoss And Algae Killersof September 2025
112M consumers helped this year.
18% off
1
Wet & Forget Mould, Lichen & Algae Remover, Outdoor Patio Cleaner, Black Spot Remover, Bleach Free, 5L
Wet & Forget
9.7
2
Jarder Spray & Leave 4 x 5 Litre Concentrate Cleaner - Patio Fencing Decking - Green Mould & Algae Killer (20L)
Jarder
9.4
3
Spear & Jackson - Spray and Leave Concentrated Mould, Algae and Lichen Remover - 5 Litre
Spear & Jackson
9.1
4
Spear and Jackson Moss Gone Moss killer 5 Litre with long hose trigger, Fast Acting, Suitable on Paths, patios and hard surfaces
Spear and Jackson
8.9
10% off
5
Pro-Kleen MY16 Patio Cleaner Simply Spray and Walk Away Green Mould and Algae Killer for Patios, Fencing and Decking 5 Litre Concentrate (Makes 25 litres)
Pro-Kleen
8.6
OtherUp to 23% off
Pro-Kleen Simply Spray & Walk Away Concentrate Patio - Fencing - Decking - Green Mould and Algae Killer (20L Simply Spray)
Miracle-Gro EverGreen Mosskill Lawn Food and Moss Control, 2.8kg, 80 m2, Brown
Pro-Kleen 260735 Ready to Use Simply Spray & Walk Away Green Mould and Algae Remover (1 x 5 litres) Patio, Fencing and Decking Cleaner, Multi
Value Pack of 2 (Save on Postage) - Patio Magic! 2.5 Litres Liquid Concentrate Mould, Algae and Moss Killer
6
2 x Algon Organic Path and Patio Cleaner Concentrate 2.5l
Grace nnvg
8.3
14% off
7
Wet & Walk Away Concentrate - Organic Moss & Algae Remover for Garden Spaces – Brighten and Clean Your Patio, Indian Sandstone, Driveway, Decking, Astroturf and Bricks – Covers up to 300m² – 5 Litres
Gro Garden Products
8.0
8
SmartSeal 'Green Clear' Highly Concentrated - Easy to Apply Best Mould, Lichen & Algae Remover - Quickly Kills Organic Green Growth from Roofs, Driveways & Patios - Algae Killer For Driveways (5L)
SmartSeal
7.7
18% off
9
GLEAN Green Clean Algae Remover | 1L Covers 10m² | Ready to Use Spray | Patio Cleaner for Moss, Mould, Lichen & Algae | Spray and Leave | Paths, Fences, Roof Tiles, Decking, Brick & Concrete Surfaces
GLEAN
7.4
10
Algon 20L Organic Path and Patio Cleaner Concentrate Drum
Algon
7.1
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A Guide to Selecting the Best Moss And Algae Killers
When choosing a moss and algae killer, it's important to consider the specific needs of your outdoor space and the type of surfaces you are treating. Different products are formulated to target specific types of moss and algae, and some are better suited for certain surfaces than others. Understanding the key specifications will help you select a product that effectively addresses your problem without causing harm to your plants, pets, or the environment.
Active Ingredients
The active ingredients in moss and algae killers are the chemicals responsible for eliminating these unwanted growths. Common active ingredients include iron sulfate, potassium salts of fatty acids, and ammoniated soap of fatty acids. Each has different levels of effectiveness and environmental impact. For instance, iron sulfate is effective but can stain surfaces, while potassium salts are more environmentally friendly. Choose an active ingredient based on the severity of your moss or algae problem and your environmental concerns.
Application Method
The application method refers to how the product is applied to the affected area. Common methods include sprays, granules, and concentrates that need to be mixed with water. Sprays are convenient for small areas and hard-to-reach spots, while granules are suitable for larger areas like lawns. Concentrates offer flexibility in mixing strength but require more effort to apply. Consider the size of the area you need to treat and your comfort with the application process when choosing a method.
Coverage Area
Coverage area indicates how much surface area a product can treat effectively. This is usually measured in square feet or square meters. A product with a larger coverage area is more economical for treating extensive moss or algae growth. However, for smaller areas, a product with a smaller coverage area might be more appropriate to avoid waste. Assess the size of the area you need to treat to determine the appropriate coverage.
Safety for Plants and Pets
Safety for plants and pets is a crucial consideration, especially if the treated area is accessible to animals or near desirable plants. Some moss and algae killers are formulated to be safe for use around pets and plants, while others may require precautions such as keeping pets away until the product has dried. If you have pets or valuable plants nearby, opt for a product that is labeled as safe for these conditions.
Rainfastness
Rainfastness refers to how quickly a product becomes resistant to being washed away by rain. This is important in ensuring the effectiveness of the treatment, especially in areas with frequent rainfall. Products with higher rainfastness can withstand rain shortly after application, making them more reliable in wet climates. Consider the typical weather conditions in your area when evaluating this specification.
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