What happens to a Heat Exchanger if there is debris in the water, or high mineral content?

Issue:  
What happens to a Heat Exchanger if there is debris in the water, or high mineral content? 

Product line:
Network Air FM, ACRD200, Uniflair Multi-Cool 

Environment:
All Serial Numbers 

Cause:  
Blockage 

Resolution:  

Pic. 1: Completely blocked channels secondary side (water-side)

Pic. 2: Copper corrosion secondary side (water-side)

Pic. 3: Completely blocked channels secondary side (water-side)