Cider: Making, Using & Enjoying Sweet & Hard Cider - Proulx & Nichols
Potassium Sorbate - 1 oz (28 g)
Potassium Metabisulphite - 2 oz (56 g)
Campden Tablets (Potassium Metabisulphite) - 1 oz (28 g)
Liquid Isinglass Fining Additive - 4 fl oz (120 ml)