1. A delayed release delivery system, comprising:at least one treated particle, the treated particle, comprising:
a hydrophilic core particle having surface pores and a liquid contained therein, the hydrophilic core particle being further encapsulated by a polymer having a hydrophobic backbone and a plurality of hydrophilic pendant groups,
wherein at least some of the surface pores adjacent the hydrophilic pendant groups are blocked in the presence of water and unblocked in the absence of water, and
wherein the polymer is modified with polyglycerol pendant groups.