In some conditions, water kefir grains grow and multiply profusely. It’s usually a combination of the type of water, temperature and other growing conditions. Do you have too many healthy grains? We’ll buy them back. Contact us at at email@example.com when you have more than 5 cups of grains and we will send you a shipping label, money e transfer and instructions on how to prepare them for shipping. We currently only accept Canadian grains due to border restrictions.