Blagdon Koi Anti Fungus& Bacteria is a unique treatment based on several active ingredients that act against Fungus (Saprolignia sp. and Achlya sp). and also Finrot and Mouthrot causing bacteria, (Myxobacteria sp. and Flexibacter sp.) This is a five day course of treatment to slowly build dosage levels in the pond, this maximizes the effect of the treatment whilst minimizing stress on the fish. The treatment can be used on all pond fish but is specially formulated for Koi Carp. How much do I need? 250ml Treats 2,273 Litres (500 Gallons) for 5 Days 1000ml Treats 9,092 Litres (2,000 Gallons) for 5 Days Use to treat Cotton wool fungus, Finrot and Mouthrot. The treatment is now in an easy does bottle 25ml treats 1,136 Litres (250 Gallons)