In the real world, contaminated water is a risk for all deluge systems. Dissolved minerals accumulate in pipework in the form of scale deposits that impede the flow of water. Other common contaminants such as salt, bacteria and foreign bodies can create blockages that prevent first-time activation, with all the consequences that entails.
With the right technology, the risks from water contamination can be managed much more effectively. This reduces the need for frequent wet tests and other expensive servicing and maintenance.