Praziquantel Treatment is an effective solution for treating external protozoan parasites in ponds. Poor water quality and the introduction of sick or stressed fish are common causes of such issues, so it's important to resolve them as soon as possible. Aquascape Praziquantel Treatment can help, but it's important to accurately dose. Before using, take the time to calculate the water volume of your pond and discontinue the use of UV clarifiers or other chemical filtration. Proper oxygenation is also necessary during treatment.