#Forcite #Seawater Desalination #Packing #MD

Dear everyone, 

I want to construct a MD model to simulate the seawater desalination. 
 

But I find if I use the Packing task in Amorphous Cell. I won't use the Packing function to create a membrane with different solutions on both sides, I can only create a membrane system with a single solution present.

I want to replace the solution on the left with a saline solution. How should I do. QAQ