sentences:  They are supplied by the Department for Communities and Local Government, to respond to incidents involving mass decontamination, defined as incidents where more than one person can be decontaminated simultaneously using the same equipment.Each IRU is maintained by a host station with assistance from support stations which all receive training on the equipment at regular periods throughout the year.The high volume pump (HVP) has the capability of delivering large volumes of water over great distances utilising additional pumps.