MKS' DI-NH3 is a compact, stand-alone system providing dissolved ammonia water. With Semiconductor 3D IC architectures using new materials like Cu-Co and Si-SiGe, the ability to wet clean with precise alkaline chemistries is growing in frequency and importance. The DI-NH3 delivers dissolved ammonia, providing optimal cleaning capability in an alkaline chemistry, minimizing material loss and contamination and inhibiting Electrostatic Discharge (ESD). Using closed-loop control, conductivity and pressure are kept stable under changing flow conditions. The dissolved ammonia concentration is monitored and adjusted, delivering the specific NH4OH concentration needed.