Water Nuggets Practice Exam 2026 – Complete Study Resource

In water systems with low alkalinity and calcium levels, polyphosphates are effective at inhibiting corrosion. They function by forming a protective coating on the surfaces of metal pipes and components. This coating helps to prevent the direct contact of corrosive agents in the water with the metal, thereby reducing the rate of corrosion.

Polyphosphates can also help to stabilize calcium and prevent the deposition of minerals, which can be particularly valuable in low alkalinity scenarios where calcium levels might not be sufficient to form protective scale. By maintaining a balance and protecting the metallurgy in the system, polyphosphates contribute significantly to the longevity and integrity of the water distribution infrastructure.

The other options, while they may have their own applications in water treatment, do not specifically target corrosion inhibition in environments characterized by low alkalinity and low calcium levels in the same effective manner as polyphosphates.