Pond Use of Formalin for Koi Diseases

Formalin is a mixture of formaldehyde gas in water. It’s not an easy mix to stabilize and sometimes they use Methanol to make it more stable. Formalin and Formaldehyde are essentially the same things. Formalin, by definition, is Formaldehyde at a concentration of 37% in water. Pond Use of Formalin for Koi Diseases To use … Read more

How to use Formalin in Aquaria

Formalin 37% should be used as a long term treatment for ornamental fish to clear parasites. It has been suggested in the literature that this can be left in a treated system indefinitely. The dose is 25ppm and that is achieved by using 1 cc Formalin per 10 gallons of water. This can be left … Read more