Everbuild patio wizard kills algae green growth mould and fungi on patios paths driveways and all hard surfaces it is a cleaner that safely removes all types of green growth without the need for any washing off scrubbing and pressure washing available in standard 10 to 1 concentrate in 1 5 litres 1 litre makes 10 litres and 5 litres of concentrate makes 50 litres and 50ml concentrated sachets that are mixed with 5 litres of water