To keep your milk smooth, we recommend shaking it up in your Nimbus bottle, an empty jar, or any other enclosed container. If you prefer stirring, make sure there’s enough room for a vigorous stir. The granules will continue to absorb water for a few hours, so don't worry about any undissolved powder as it will slowly dissipate into a perfectly smooth liquid. We find that for best results (and full flavour!), it's best to make it a bit in advance of use.Natural separation may occur between uses (this happens in cartons too, you just can’t see it!) but a quick shake will fix this.