Buffered Formalin Concentrate 5 mixes one part (one gallon) to four parts (four gallons) water to make a five gallon batch of 10% Neutral Buffered Formalin.
All that is required is to pour a gallon of the Buffered Formalin Concentrate 5 into an empty five gallon carboy and fill with water.
Available in 1 gallon or a 4 x 1 gallon case.