Patio Magic is a dynamic algaecidal detergent which works without the need for manual scrubbing or pressure-washing.Anti-viral and anti-bacterial disinfectant, fungicide/algaecide and detergent. It kills mould, algae and mildew within typically 2-3 days, has a secondary slow-acting cleaning effect on many surfaces, and normally helps to prevent re-growth for many months. This product is readily biodegradable, contain no bleach or acids, and is fully HSE and PCS approved.