Dear Arsalan The Maximum ...

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Dear Arsalan

The Maximum guaranteed value of the high quality membranes made by reputable manufacturers is 80,000 ppm on reject line. So considering 40% recovery, you can have max. 50,000 ppm on inlet. That is why some software will stop calculation over 50,000 ppm

This is the first reason. there are also pressure and material limitations in high TDS values for RO unit desalination design. 

Hope with new coming technologies , these problems would be solved

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