Our super strength formula is used by trusted professionals! Pro-Kleen's Law Tonic is used by greenkeepers, lawn keepers, park keepers and sports groundsmen to allow them to get the perfect pitches and green lawns! Lawn disease is a common problem in the UK and causes many people's gardens, pitches or outdoor spaces to develop dying and brown grass. Our Lawn Tonic is thoroughly revised, tried and tested and is sure to harden the turf to prevent lawn disease from taking place. Our formula is super concentrated and comes in 5-litre bottles, ensuring that a little goes a long way! It also makes it easier to dilute to your required amount (depending on the size of the area that needs to be covered). Transforming your grass has never been easier. With our Lawn Tonic you can turn your dull and dying grass into strong and green grass in no time! ProKleen Liquid Iron Sulphate Lawn Tonic Feed 2 x 5L in Green