Which of the following contributes most to the longevity of an installed system?

Proper installation and maintenance practices are crucial for ensuring the longevity of an installed system. When a water treatment system is correctly installed, it operates as intended, minimizing unnecessary stress on its components. Factors such as alignment, securing fittings, and correct setup of individual parts all contribute to the overall efficiency and durability of the system.

Additionally, regular maintenance is essential to monitor the system's performance and prevent the buildup of wear and tear, leaks, or malfunctions. Routine checks and timely repairs can address potential issues before they escalate into more significant problems, thereby extending the system's lifespan.

Other factors, such as regular cleaning or upgrading components, play important roles but are typically subordinate to the foundational impact of proper installation and ongoing maintenance. Choosing the most expensive model does not necessarily guarantee longevity; a higher price does not equate to better performance if the installation and maintenance are lacking. Therefore, focusing on sound installation and diligent maintenance practices will yield the best results in enhancing the lifespan of the installed water treatment system.