Pool Equipment and Maintenance Flashcards
6 cards from real NPLQ practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Pool Equipment and Maintenance flashcards as text
What is the purpose of pool water balance testing using the Langelier Saturation Index (LSI)?
Answer: To assess whether pool water is corrosive (undersaturated) or scale-forming (oversaturated), guiding chemical adjustments to protect equipment and bather comfort
The LSI combines pH, temperature, calcium hardness, and alkalinity to determine whether pool water is in balance, aggressive (dissolving concrete/metals) or scale-forming (depositing calcium carbonate).
What is the role of total alkalinity in pool water chemistry?
Answer: To act as a pH buffer, stabilising pH against sudden swings from bather activity or chemical additions
Total alkalinity (primarily bicarbonate) acts as a buffer, resisting pH changes caused by bather acids, rain water, or chemical dosing errors. PWTAG recommends 80–200 mg/l.
What does the term 'turnover rate' mean in pool circulation and why does it matter?
Answer: The time taken for the full pool water volume to pass through the filtration system — shorter turnover means better water treatment
Turnover rate (or turnover period) is the time taken for the entire pool volume to pass through the filtration system. A shorter turnover period provides more frequent water treatment and better clarity.
What is the function of a pool overflow channel (scum channel or overflow gutter)?
Answer: To skim surface contaminants (body oils, sunscreen, debris) from the water surface and feed them to the circulation system for treatment
The overflow channel (scum trough/gutter) continuously skims the water surface, removing oils, lotions, and organic material that float on the surface and drawing this water to the filtration system.
What action must pool operators take when a 'faecal contamination' incident occurs in the pool?
Answer: Clear the pool, confirm contamination, apply a hyperchlorination shock treatment, allow sufficient contact time, retest water, and only reopen when parameters are within safe limits
Faecal contamination requires pool clearance, verification of the type of incident, hyperchlorination to a specific level, adequate contact time, retesting, and confirmed safe parameters before reopening.
What is the recommended inspection schedule for poolside safety equipment such as the throw line bag?
Answer: Before every operational session — checking that the rope is dry, untangled, correctly packed, and the bag is intact and accessible
Safety equipment including throw lines must be inspected before every session to ensure it is ready for immediate use. An improperly packed throw line bag in an emergency can cost a casualty's life.