How to use HG algae and mould remover?

To remove green algae effectively and prevent it from returning, we offer a range of solutions. These include HG algae and mould remover concentrate and ready‑to‑use variants. These products tackle algae growth on tile paths, flagstones, walls and roofs, and then protect surfaces for many months against new growth. You may find online tips about home remedies such as green soap, cleaning vinegar or citric acid, but we advise against using these. Algae control falls under biocide legislation, and as an approved supplier, we recommend only legally approved products. Green algae is caused by moisture, lack of sunlight, organic material and poor drainage.

HG solutions for removing green algae

To effectively remove and prevent green algae, we recommend the following solutions:

• HG algae and mould remover (concentrate): This product is available in two sizes. Dilute 1 litre of product with 20 litres of water and apply during dry weather by spraying, pouring or brushing onto tile paths, flagstones, gravestones, walls and roofs. After a few days, remove the dead algae by rinsing or scrubbing. A follow‑up treatment prevents regrowth for several months. When diluted, the product does not affect grass and plants.
• HG algae and mould remover ready‑to‑use: This ready‑mixed product is suitable for quick and easy treatment of patios, balconies and other outdoor surfaces. Apply it to a dry surface during dry weather by pouring it over the area. Scrubbing or rinsing is not required. Results become visible after approximately 36 hours, and the product is suitable for all surfaces, covering between 25 and 50m².

For more information and additional tips, consult our guide on removing green deposits.

Solutions for tackling green algae

When searching online for solutions to green algae, you may find a range of household remedies. We strongly advise against using these. Green algae control falls under biocide legislation, and as an approved supplier we recommend only legally approved products. The following examples are commonly mentioned, but have important limitations:

• Warm water mixed with green soap, applied with a brush. This method has no proven effectiveness against green algae and offers no long-term protection.
• Cleaning vinegar applied undiluted or diluted to affected areas. This can damage surfaces and does not address the root of the problem.
• Citric acid solutions applied to algae. These methods are not proven to be effective and may cause surface damage.

Always refer to the manufacturer's maintenance instructions for your surface before applying any treatment. These household methods are less effective and can carry risks. We therefore recommend choosing a legally approved product specifically developed for algae control if you're in any doubt.

What causes green algae and how to prevent it

Green algae develops due to several conditions:

• Damp conditions: Algae thrives in moist environments. Ensure good ventilation and try to keep surfaces dry to prevent algae and moss growth.
• Lack of sunlight: Shaded areas allow algae to grow more easily. Try to expose affected areas to direct sunlight regularly where possible.
• Build‑up of organic material: Leaves, soil and debris encourage growth. Keep your garden or patio clean and remove organic material regularly.
• Poor drainage: Standing water prolongs surface dampness. Ensure surfaces drain well to prevent water pooling.

To help prevent algae formation, ensure good drainage, remove organic debris regularly and clean surfaces with suitable products. Always follow safety instructions and use protective gloves when applying cleaning agents. To remove green algae, we recommend using a specialist cleaning product, such as the HG algae and mould remover. Follow the instructions on the packaging carefully and take necessary precautions, such as wearing protective gloves.