Its aliases include natural or unenriched uranium, depleted uranium (DU), tubealloy (Tu), and 28. Reactor-grade heavy water must be 99.75% pure to enable reactions with unenriched uranium. Unenriched sequencing libraries often have abundant undesired sequences. Birch used unenriched uranium to create scale models and later full-scale mock-ups of the device. The pilasters support the unenriched entablature and a pediment. Unenriched water gas may be described as Blue water gas (BWG). Unenriched natural uranium is appropriate fuel for a heavy-water reactor, like a CANDU reactor. The density and composition of the phytoplankton (microscopic water plants) indicated an "unenriched" lake condition.