The Fungus Fly Killer nematode 50 million pack contains enough nematodes to treat an area up to 100 square metres or approximately up to 2000 2 litre pots. Ensure the compost is damp/moist before application.Mix the contents of the pack in 5 litres of water. Stir the contents. Take 0.5 litres of the concentrate and add to an 8 litre or 2-gallon watering can of clean water, and mix. Using a coarse rose, water into the compost. The concentrate can be used to fill up to 10 watering cans. A knapsack sprayer can also be used for the application.