How to handle huge amounts of mold in my wall
When you say concrete walls are you indeed referring to a poured wall of concrete as they do in many overseas countries or are you referring to cinderblock walls back poured with concrete? 

If you mean cinderblock walls: Building a carwash we would thinset over the cinderblock walls and then apply a coat of Watertite LX. It has been about 10 years now and we have yet to see any mold or water seepage through the carwash bay into the guest walk areas, in which both slides are bare cinderblock.

It is guaranteed for 15 years when used according to the directions.

Link to product and I do not work for Walmart. :P