What is the best practice for testing a discharge line when diagnosing low flow conditions?

• A. Replace the pump with a new unit.
• B. Increase discharge pressure by closing the relief valve.
• C. Inspect for kinks or obstructions, test with the line off to verify free flow, and straighten or replace hose as needed.
• D. Shut down system and restart.

Answer: (C)

When diagnosing low flow in a discharge line, the best approach is to first inspect the line for physical restrictions and then verify flow by isolating the line. Start by looking for kinks, twists, collapsed sections, or any obstruction in the discharge hose and fittings. These simple line issues are common causes of reduced flow and are easy to fix once found. Next, test the discharge path with the line removed from the pump (line off) to confirm whether water can flow freely. This step separates problems in the line from issues inside the pump or on the suction side. If the water flows freely with the line off, the discharge hose or connections are the culprit; straighten, clean, or replace the hose as needed and reassemble. After restoring the line, re-test under normal conditions to ensure adequate flow. This method isolates the line and confirms its integrity before pursuing pump-related diagnostics or repairs.