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Kusuri Malachite Green is best used with Kusuri Formalin 30% for the effective treatment of most single-cell parasites including White Spot, Costia, Chilodonella, Oodinium, persistent Fungus caused by Saprolegnia and Protozoan Parasites.


Do not use below 12.5°C (54.5°F).


Mixing Formalin and Malachite Green is an effective way of treating most microscopic parasites.


Please ensure that you read, understand and follow all Health and Safety guidelines on the bottle.


Please do not eat, drink or smoke whilst handling chemicals.


Wear disposable vinyl or latex gloves and appropriate eye protection.


Dosage: 50 ml per 880 gallons (4004 litres) of pond water.


For our handy dosage calculator, click here!



  • Treat up to 3 times, 5-7 days apart.
  • Switch off UV steriliser until course of treatment is complete.
  • If using in conjunction with Kusuri 30% Formalin, reduce dose to 25 ml per 880 gallons (4004 litres).
  • Fill a clean watering can with pond water, then add Kusuri Malachite Green.
  • Slowly apply to the pond over a 1 hour period, this will prevent shocking the pond with a highly concentrated dose.


Do not use below 12.5°C (54.5°F).


Malachite Green is safe to use with salt. If using Malachite Green with Formalin, do NOT use in conjunction with salt.

Kusuri Malachite

SKU: MD916
PriceFrom £14.00
  • Collection from our premises near Chepstow in South Wales by appointment or delivery to British mainland addresses.


    Delivery is £8.95 per order for most dry goods, with some more expensive delivery charges applicable for very heavy or long items.


    Please note delivery for dry goods is typically 2-5 working days and items may be sent in separate packages.

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