PTI TEST CERTIFICATION PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
● Free Chlorine. Answer: Amount of chlorine available to sanitize pool water
● Combined Chlorine. Answer: Chlorine that has reacted with ammonia compounds, less
effective sanitizer
● Breakpoint Chlorination. Answer: Adding enough chlorine to destroy all chloramines in
pool water
● pH. Answer: Measure of acidity or alkalinity on a scale of 0 to 14
● Total Alkalinity. Answer: Concentration of alkaline substances buffering pH in pool water
● Calcium Hardness. Answer: Dissolved calcium concentration affecting water balance and
corrosion
● Cyanuric Acid. Answer: Chlorine stabilizer protecting free chlorine from UV degradation
● Langelier Saturation Index. Answer: Formula determining water balance and corrosion
potential
● Water Balance. Answer: State where pool water is neither corrosive nor scaling
● Sand Filter. Answer: Filter using silica sand to trap debris and contaminants
● Cartridge Filter. Answer: Filter using polyester cartridges to capture fine particles
● DE Filter. Answer: Diatomaceous earth filter providing the finest particle removal
● Backwash. Answer: Reversing water flow through a sand filter to clean out debris
● Pump. Answer: Mechanical device circulating water through the filtration system
● Turnover Rate. Answer: Time required to circulate the entire pool volume through the filter
● Flow Rate. Answer: Volume of water moving through the system per unit time
● GPM. Answer: Gallons per minute, measurement of flow rate in pool systems
QUESTIONS WITH ANSWERS GRADED A+
● Free Chlorine. Answer: Amount of chlorine available to sanitize pool water
● Combined Chlorine. Answer: Chlorine that has reacted with ammonia compounds, less
effective sanitizer
● Breakpoint Chlorination. Answer: Adding enough chlorine to destroy all chloramines in
pool water
● pH. Answer: Measure of acidity or alkalinity on a scale of 0 to 14
● Total Alkalinity. Answer: Concentration of alkaline substances buffering pH in pool water
● Calcium Hardness. Answer: Dissolved calcium concentration affecting water balance and
corrosion
● Cyanuric Acid. Answer: Chlorine stabilizer protecting free chlorine from UV degradation
● Langelier Saturation Index. Answer: Formula determining water balance and corrosion
potential
● Water Balance. Answer: State where pool water is neither corrosive nor scaling
● Sand Filter. Answer: Filter using silica sand to trap debris and contaminants
● Cartridge Filter. Answer: Filter using polyester cartridges to capture fine particles
● DE Filter. Answer: Diatomaceous earth filter providing the finest particle removal
● Backwash. Answer: Reversing water flow through a sand filter to clean out debris
● Pump. Answer: Mechanical device circulating water through the filtration system
● Turnover Rate. Answer: Time required to circulate the entire pool volume through the filter
● Flow Rate. Answer: Volume of water moving through the system per unit time
● GPM. Answer: Gallons per minute, measurement of flow rate in pool systems
