MO Bacter Instant Organic Lawn Fertiliser by Viano will destroy moss within 24 hours but is safe to use on lawns used by children & pets This 2L bottle covers 250m 2 & 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 & moss has been removed Dead moss will need to be removed No added magnesium or bacteria Organic