Which of the following practices ensures effective water treatment system setup?

Adhering to manufacturer's specifications is crucial for ensuring an effective water treatment system setup because these guidelines are developed based on extensive research and testing. Manufacturers design their systems to work optimally under specific conditions and with particular components. Following these specifications ensures that the system operates efficiently, maintains its longevity, and provides the intended level of water treatment.

By using components and settings that align with what the manufacturer recommends, technicians can avoid potential issues such as inadequate filtration, system failures, or even safety hazards. These specifications often include details on installation processes, maintenance schedules, and operational parameters that are essential to achieving the best results.

While the other options suggest practices that could compromise effectiveness—like skipping pre-inspections, selecting arbitrary filters, or ignoring water pressure requirements—adhering to manufacturer specifications mitigates these risks, leading to a successful water treatment system setup.