Cider Brite Finings by Harris Homecraft. Cider Brite contains freeze-dried isinglass finings specially formulated for clearing cider. This tube of Cider Finings containsn enough to treat three 5 gallons (25 litre) containers of homemade cider. Instructions for use: add 2 level teaspoons of powder into half a cup of cold water. Whisk with a fork for a minute to thoroughly mix. Leave the finings and water for 15 minutes, then whisk again before adding to 5 gallons (25 litres) of cider at the end of fermentation.