60Ml (2 oz) Liquid Isinglass Easy-to-use pre-mixed form. (2 oz Good For 5-6 Gallons) Isinglass is made from the cleaned and dried swim bladders of certain fish and contains a very pure form of collagen. It has a positive charge and attracts negatively charged proteins and yeast dropping them to the bottom of the fermenter. Add to the secondary fermenter 2 to 3 days before bottling/kegging. Usage: 1 to 2 fluid oz. treats 6 gallons of finished beer or wine. 2 oz bottle.