Patio Black Spot Preventer 2.5L

Keep patios, paths, paving and decorative stonework cleaner for longer with Patio Black Spot Preventer — a spray-and-leave patio treatment for all stone types.

Specially formulated for year-round patio protection, this long-lasting black spot preventer helps stop staining, discolouration, black lichen, green algae and red algae from returning to garden stone surfaces. It is ideal for homeowners who want to maintain clean patios and paths without constant scrubbing, jet washing or pressure washing.

Each 2.5 litre container treats up to 50m² once diluted and is designed for use 11–12 months after applying Patio Black Spot Remover. Used annually, it helps prevent black stains and black spots from reappearing while clearing green and red algae within 3–5 days of treatment. The result is cleaner, safer patios, paths and paving with minimal maintenance.

Unlike standard patio cleaners, Patio Black Spot Preventer works proactively to protect outdoor stone surfaces from future staining and organic growth. It helps preserve the natural colour and appearance of patios, pathways and garden stonework, while reducing slippery algae build-up and keeping high-traffic areas easier to maintain.

Patio Black Spot Preventer is pet-friendly once dry. As a precaution, keep pets away from treated patios, paths or paving during application. Once the surface has dried, it is safe for pets to walk on the area.

Supplied in liquid form. Pour into a 5-7 Litre Hozelock garden pneumatic sprayer and dilute with 3 parts water. Biodegradable. Coverage – not exceeding 5 SQM per 1L (once diluted). No need to scrub or wash away.