Pro-Kleen Lawn Tonic Liquid Iron Sulphate 5L. For Turf Hardening: Mix 500ml Liquid iron sulphate with 5 Litres of water. For Grass Greening: Mix 250ml Liquid iron sulphate with 5 Litres of water. Pro-Kleen Lawn Tonic is the perfect product to get your grass looking strong, healthy and green again.
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