The addition of Calcium Chloride generally improves the rennet coagulation properties of your milk and this is particularly true when using pasteurised milk that has been stored in a refrigerator.

Pasteurising and then cold storing milk impairs the milk’s rennet coagulation properties, reduces the recovery of protein and fat, and reduces cheese yield.

There is a scientific explanation that we will not go into here; however, the addition of Calcium Chloride, which is a salt solution, solves this problem with milk purchased from the grocery store, and allows you to make cheese with this milk by restoring the milk’s ability to coagulate and form a good curd with the addition of rennet.