Tube membrane distillation (MD) integrated with a crystallization method is used in this study for the concurrent productions of pure water and salt crystals from concentrated single and mixed system solutions. The effects of concentrated Zn2+ and Ni2+ on performance in terms of membrane flux. permeate conductivity. crystal recovery rates. https://www.roneverhart.com/Liftmaster-CSL24UL-Slide-Gate-Opener/