Topical concentrate to take away water surface tension. Water tension allows mosquitoes to land on water surface where they drink and deposit larvae. Without water tension, mosquitoes at all stages will sink and drown. Non-Toxic. Pond and Fountain protector is a 16 oz bottle. Cap-full will treat 100 gallons of water. All contaminates are dissolved as Pond Protector is designed to leave a protective barrier which does not allow for mineral deposits to adhere.