Keep your grass luscious and strong all year round with Pro-Kleen's Liquid Iron Sulphate Lawn Tonic. It is used by greenkeepers, lawn keepers, park keepers and sports groundsmen to allow them to get the perfect pitches and green lawns. The lawn tonic is sure to harden the turf to prevent lawn disease from taking place. It comes with a formula that is super concentrated and comes in 5-litre bottles, ensuring that a little goes a long way! Pack size: 5 litres. Usage: Simply mix the suggested dosage with water and using a pump sprayer or a watering can, apply it to the grass that you wish to treat. After it has been applied, simply wait for the results to appear!