Resolva Moss Killer Is A Ready-to-use Formulation In A Trigger Spray That’s Comfortable To Handle; It Effectively Kills Moss & Algae On Natural & Permeable Surfaces Such As Gravel, Block Paving & Gravel. Do Not Use On Lawns.this Easy-to–use Spray Gun Gives You Piece Of Mind That You Can Quickly Rid The Moss & Algae Which Forms Over Time In Paving Cracks & On Patios So You Have Spotless Outdoor Spaces In Time For Barbacues & Summer Garden Parties.see Results In 24 Hours From Resolva Moss Killer Ready-to-use Spray With Unique Non-drip Trigger. Follow Full Instructions Given On The Back Of The Spray Gun & Store In A Cool, Dry Place.for The Most Effective Results Use In Temperatures Over 15°c In Dry, Still Periods. If Rain Falls Within 12 Hours After Use You May Need To Re-apply. Do Not Spray In Windy Weather Where Spray May Drift Onto Other Garden Plants. Re-application At 3-4 Week Intervals May Be Needed.1 Litre – Enough For 10 Square Yards (square Metres).resolva Moss Killer Conatians Pelargonic Acid. Use Plant Protection Products Safely. Always Read The Label & Product Information Before Use.