A good General Medication and also to aid eliminating known parasites within the pond. If used in conjunction with Formalin it will eradicate Both Skin and Gill flukes - White Spot & Costia ...
Malachite green and Formaldehyde are the best treatment for common external parasitic infections.
Malachite green 2% Malachite can be used for the treatment of many parasitic infestations when used with Formalin. Malachite can be used on its own with salt as a bath treatment. Mixing Malachite with Formalin is effective at treating most other microscopic parasites.
For use above 10c (50f) typical dosage 50 ml to 880 gallons.