Facility Operations & Maintenance Flashcards
7 cards from real NASCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Facility Operations & Maintenance flashcards as text
What does the Langelier Saturation Index (LSI) measure in pool water chemistry?
Answer: Water's tendency to be scale-forming or corrosive
The LSI calculates the balance of pH, alkalinity, calcium hardness, and temperature to predict whether water will deposit scale or corrode surfaces.
A facility operator finds the pump is running but water flow to the pool is very low. What should be checked FIRST?
Answer: Pump strainer basket for blockage
A clogged pump strainer basket is the most common cause of reduced flow and should be the first point of inspection.
What is the minimum recommended turnover rate for a public swimming pool?
Answer: Every 6 hours
Most public pool codes require all pool water to pass through the filtration system at least once every 6 hours to maintain water clarity and sanitation.
Which hazard is MOST directly associated with high combined chlorine (chloramines) levels in an indoor pool?
Answer: Respiratory irritation for swimmers and staff
Chloramines are volatile compounds that off-gas into the air, causing eye, skin, and respiratory irritation — especially problematic in enclosed indoor facilities.
What action should a pool operator take when total dissolved solids (TDS) exceed 1,500 ppm above the source water baseline?
Answer: Partially drain and refill with fresh water
Elevated TDS impairs chemical effectiveness and cannot be removed by filtration — draining and diluting with fresh water is the only remedy.
What is the purpose of cyanuric acid (CYA) in outdoor pools?
Answer: It stabilizes chlorine against UV degradation
Cyanuric acid bonds with free chlorine to protect it from rapid UV sunlight degradation, extending its effective life in outdoor pools.
Which maintenance task should be performed BEFORE reopening a pool that has been closed for the winter season?
Answer: Inspecting and pressure-testing all plumbing and equipment
A comprehensive inspection of plumbing, fittings, equipment, and drain covers must occur before reopening to identify freeze damage and safety hazards.