Anti-parasite treatment for Koi. Formalin 7 treats persistent parasite infections of pond fish such as White Spot, Trichodina, Costia and Chilodonella.
Recommended dosage: A course of treatment over 7 applications. Use when fish are flashing against rocks, gasping at the surface etc.
10ml treats 700 litres
2.5 litres treats 7 x 25,000 litres
Add one dose every week for 7 weeks.
Switch off UV until 5 days after the final dose has been added.
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