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The Pro-Kleen 2.5kg Premium Iron Sulphate Lawn Tonic/Lawn Conditioner & Moss Killer is an affordable moss killer that you can buy. With 2.5kgs there is so much that you can do with it especially when you have a small garden. We like that it can be used in both dry and wet form making it diverse. Follow the instructions to get the expected results. If you have thick moss coverage, you might want to scarify first.