I bought a big 16 oz bottle of real pee this year from a guy at work who has a connection. I bought it to start and maintain scrapes with but anyways he told me that I should have enough left over at the end of the season to start scrapes again next year with, until a new fresh shipment arrives. But he told me whatever I have left over this year put it in the freezer until next season. He said it will help it stay fresh throughout the summer.