Line strainers are used in foam-water systems to remove solids to prevent:

• A. Taste impairment
• B. Corrosion
• C. Clogging of discharge devices
• D. Foam instability

Answer: (C)

The main idea is to keep the discharge devices clear by removing solids from the incoming foam-water mix. Debris and particulate matter can lodge in lines, nozzles, eductors, and proportioners, causing reduced flow or complete blockages. When components clog, foam delivery and fire suppression performance suffer at the moment they’re most needed. Filtering out these solids helps ensure reliable foam discharge and proper operation of the system. Taste impairment, corrosion, and foam instability aren’t the primary reasons for line strainers—the filter goal is specifically to prevent obstructions in discharge devices.