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
When should a pool operator perform a water chemistry test at minimum during high-use periods?
Answer: Every 4 hours or before each operational period
During high-use periods, most health codes and NASCO guidelines require testing at least every 4 hours to ensure chemical levels remain within safe ranges.
A pool has a combined chlorine reading of 0.6 ppm and a free chlorine reading of 1.2 ppm. What is the total chlorine?
Answer: 1.8 ppm
Total chlorine equals free chlorine plus combined chlorine: 1.2 + 0.6 = 1.8 ppm.
What is the primary regulatory purpose of a pool log or water chemistry record?
Answer: Providing documentation of compliance and enabling trend analysis
Chemical logs provide a compliance record for health inspectors and allow operators to identify trends such as recurring pH drift or chlorine demand spikes.
Which condition would cause a DPD test kit to give a 'bleached out' (false low) chlorine reading?
Answer: Very high chlorine levels above 10 ppm
At very high chlorine concentrations, excess oxidizer bleaches the DPD indicator back to colorless, producing a falsely low or zero reading — this is called the 'fade out' effect.
What minimum depth of water must be present at the point of entry for a head-first dive to be considered safe according to aquatic safety standards?
Answer: 9 feet
NASCO and most aquatic standards require a minimum of 9 feet of water depth in the diving envelope for safe head-first entry from a 1-meter springboard.
What is the recommended calcium hardness range for swimming pool water?
Answer: 200–400 ppm
Calcium hardness of 200–400 ppm prevents water from being corrosive to plaster and metal surfaces or from depositing scale on pool equipment.
Under NASCO guidelines, which situation requires a pool to be closed immediately for remediation?
Answer: Fecal contamination incident in the pool
A fecal contamination incident requires immediate pool closure, hyperchlorination to appropriate CT values, and clearance testing before reopening to prevent disease transmission.