NT Labs Koi Care Formaldehyde Anti-Parasite Pond Treatment 250ml 500ml 1000ml
NT Labs KOI CARE FORMALDEHYDE. 500ml treats 75000 gallons. 250ml treats 3750 gallons. Formaldehyde 30% is effective against protozoan parasites. Formaldehyde can also be used in combination with Malachite to treat protozoan parasites.