Simply mix one third of the tub contents (333g) in a container holding some pond water (an old watering can would be ideal). Pour mixture evenly over your pond. We recommend that you treat your pond with the correct amount of Stop Blanketweed once a week for 3 to 4 weeks (or until the blanketweed has died). Continue with monthly doses thereafter to prevent the blanketweed from returning. IMPORTANT: Not to be used in wildlife ponds or any pond where fish or toads are spawning.