What is the purpose of the blowdown system?

• A. Regularly drains water from basin to remove any buildup.
• B. Adds fresh water to the basin.
• C. Circulates water within the basin only.
• D. Aids in air removal from the system.

Answer: (A)

Blowdown serves to keep the basin water quality in check by removing concentrated impurities. As water is used or evaporates, dissolved minerals and solids build up. Opening the blowdown allows a portion of the basin water to be discharged, carrying away these solids and any sludge. This prevents scaling, fouling, and corrosion, and helps maintain safe conductivity and pH levels in the system. That’s why the purpose is to regularly drain water from the basin to remove buildup.

Adding fresh water is makeup water, not blowdown. Circulating water within the basin describes movement, not removal of impurities. Air removal is handled by vents and air-release devices, not the blowdown line.