For the prevention and treatment of Scarid Fly infestations 10g/L Deltamethrin One off treatment: add 5ml per litre in a watering can as a drench to semi dry growing media. Kill off Scarid Fly eggs and larvae in growing media: add 0.5ml per litre of water in the nutrient tank (minus nutrient). Run for 2 hours and dump. Flush. Remake the nutrient tank. Prevent Scarid Fly infestations: add 30ml per litre of water. Spray on growing media once per week, avoiding contact with your plants. For the prevention and treatment of Scarid Fly infestations One off treatment: add 5ml per litre in a watering can as a drench to semi dry growing media. Kill off Scarid Fly eggs and larvae in growing media: add 0.5ml per litre of water in the nutrient tank (minus nutrient). Run for 2 hours and dump. Flush. Remake the nutrient tank. Prevent Scarid Fly infestations: add 30ml per litre of water. Spray on growing media once per week, avoiding contact with your plants. Scarid 10 is a registered pesticide for the prevention of scarid fly infestation. Scarid 10 is a concentrate and should be applied at a rate of 30ml per litre of water. Use: Spray onto growing medium once a week trying to avoid contact with plant.