the Strongest Moss Killer, Patio Cleaner on the Market made in the UK. With a 1 to 20 ratio our product gives you value for money in addition it has no bleaching agents so Pet Safe when dry. Simply Spray and Pour and over a short time normally a couple of days given the temperature you will see the results. This is a highly rated product tried and tested. Perfect for Tarmac Driveways, Patios, Tennis Courts, Playgrounds in addition to basically any outdoor surface even works great on Fencing, PVC, Caravans, and Motor homes. Contains no bleach! (No shelf life), Biodegradable PH8 (Water PH7) children and pets need not be excluded from treated areas (once dry). Lasts for months & helps to control re-growth. Thank you for supporting UK business.