MO Bacter Instant Organic Lawn Fertiliser by Viano will destroy moss within 24 hours but is safe to use on lawns used by children and pets This 2L bottle covers 250m2 and is best applied from March-November. Destroys moss in 24 hours Can be used in February if there is no risk of frost Best applied by a sprayer or watering can Needs to be diluted 9 parts water to one part concentrate to create 20L of ready to use product Lawn tonic has zero % P Can be used straight after mowing Reseeding can be done as soon as the tonic has worked and moss has been removed Dead moss will need to be removed No added magnesium or bacteria Organic