Pool & Recreational Water Safety Flashcards

What is the minimum required turnover rate for a public swimming pool under most state health codes?

Answer: Every 6 hours

Most state codes require public pool water to turn over (be fully recirculated and filtered) at least once every 6 hours.

A health inspector finds cyanuric acid levels at 120 ppm in an outdoor pool. What action is required?

Answer: Dilute the pool water to lower the level

Cyanuric acid above 100 ppm reduces chlorine effectiveness significantly; the corrective action is to partially drain and refill to dilute the stabilizer.

Which enteric pathogen is most commonly associated with recreational water illness (RWI) outbreaks in treated swimming pools?

Answer: Cryptosporidium parvum

Cryptosporidium is the leading cause of RWI outbreaks in treated pools because its oocysts are highly chlorine-resistant.

Under the Virginia Graeme Baker Pool and Spa Safety Act, what is required on all public pool main drains?

Answer: Anti-entrapment drain covers meeting ANSI/ASME A112.19.8

The VGB Act mandates anti-entrapment drain covers that meet the ANSI/ASME A112.19.8 standard to prevent suction entrapment injuries.

What is the recommended pH range for pool water to optimize chlorine disinfection efficiency?

Answer: 7.2–7.8

A pH of 7.2–7.8 keeps hypochlorous acid (the active sanitizing form) at effective concentrations while minimizing irritation.

A spa pool is found to have water temperature at 106°F. What is the inspector's correct response?

Answer: Require immediate closure until temperature is reduced

Most health codes prohibit spa water temperatures above 104°F due to risk of hyperthermia; 106°F requires immediate closure.

Which chemical combination creates a potentially dangerous chlorine gas reaction when used in pools?

Answer: Trichlor tablets mixed with calcium hypochlorite

Mixing trichlor (acidic) with calcium hypochlorite (alkaline/oxidizing) can cause a violent reaction producing chlorine gas and fire.