Pond Medic Formalin Pond Medic Formalin is an effective treatment against many parasites such as Whitespot, Flukes, Ciliates and Flagellates. Note Do not use below 10 Degrees C if salt is present in the pond. Always mix in a suitable container with some pond water and distribute evenly around the pond. For severe cases use as a dip at the rate of 1ml per 5 Litres for up to 30 minutes maximum, followed 48 hours later by a standard treatment.


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