POOL OPERATOR 2027 TEST PAPER ANSWERS AND
QUESTIONS SET A+
✔✔the lower the water's conductance, the more _____ the water. - ✔✔pure
✔✔disinfection chemicals added to pool water contribute to the __________ in TDS,
mostly as salt. - ✔✔increase
✔✔bleach disinfectant makes the pH ______. - ✔✔rise
✔✔as TDS increases, the amount of partially oxidized and unoxidized organic
contaminants ____________. - ✔✔increases
✔✔galvanic corrosion is observed by the - ✔✔discoloration of metal parts in the water
✔✔it is recommended that the TDS should not exceed _______ ppm higher than the
TDS when the pool was started up. - ✔✔1,500
✔✔excessively _______ levels of TDS will cause the water to look dull or tired and may
exhibit a bad or salty taste. - ✔✔high
✔✔saturation index (SI) is - ✔✔a method of determining whether water will deposit
calcium carbonate or maintain it in solution.
✔✔the ideal SI result is an SI= ___ - ✔✔0
✔✔in balanced water, the SI should be between ___ and ___ - ✔✔-.3 and +.3
✔✔in corrosive water, the SI should be ___ and lower. - ✔✔-.4
✔✔in scaling water, the SI should be ____ and higher. - ✔✔+.4
, ✔✔SI= - ✔✔Tf + pH + Cf + Af - TDSf
✔✔ryznar stability index (RSI) is used to - ✔✔judge how to maintain calcium carbonate
water balance and reduce metal corrosion
✔✔RSI estimates - ✔✔the degree to which calcium carbonate deposits, or scales on
surfaces, or dissolves/corrodes calcium carbonate from the surface
✔✔the most common use of RSI is to - ✔✔minimize metal corrosion through calcium
carbonate's providing a protective coating on the metal surface
✔✔the maximum combined chlorine in a pool is ___ ppm - ✔✔0.2
✔✔the maximum combined chlorine in spas is ___ ppm - ✔✔0.5
✔✔combined chlorine (CC)= - ✔✔total chlorine (TC) - free chlorine (FC)
✔✔free chlorine will react with organic nitrogen, containing contaminants like urea,
amino acids or proteins to produce: - ✔✔organic chloramines (CC)
✔✔treatment methods for reducing chloramines - ✔✔water replacement
breakpoint chlorination (BPC)
ultraviolet (UV)
ozone
potassium monopersulfate
indoor air handling
✔✔breakpoint chlorination (BPC) - ✔✔proccess of adding FC to treat, oxidize or remove
CC
✔✔BPC is effective in removing ___________ chloramines. - ✔✔inorganic
✔✔UV systems are effective at reducing _________ chloramines. - ✔✔inorganic
✔✔ozone is effective at removing - ✔✔inorganic and organic chloramines
✔✔oxidation - ✔✔the process of changing the chemical structure of contaminants so
they are more readily removed from the water
✔✔if the water looks dull or hazy, treating the water with an _________ often helps
improve water clarity - ✔✔oxidizer
✔✔shock/superchlorination products - ✔✔oxidize and disinfect
QUESTIONS SET A+
✔✔the lower the water's conductance, the more _____ the water. - ✔✔pure
✔✔disinfection chemicals added to pool water contribute to the __________ in TDS,
mostly as salt. - ✔✔increase
✔✔bleach disinfectant makes the pH ______. - ✔✔rise
✔✔as TDS increases, the amount of partially oxidized and unoxidized organic
contaminants ____________. - ✔✔increases
✔✔galvanic corrosion is observed by the - ✔✔discoloration of metal parts in the water
✔✔it is recommended that the TDS should not exceed _______ ppm higher than the
TDS when the pool was started up. - ✔✔1,500
✔✔excessively _______ levels of TDS will cause the water to look dull or tired and may
exhibit a bad or salty taste. - ✔✔high
✔✔saturation index (SI) is - ✔✔a method of determining whether water will deposit
calcium carbonate or maintain it in solution.
✔✔the ideal SI result is an SI= ___ - ✔✔0
✔✔in balanced water, the SI should be between ___ and ___ - ✔✔-.3 and +.3
✔✔in corrosive water, the SI should be ___ and lower. - ✔✔-.4
✔✔in scaling water, the SI should be ____ and higher. - ✔✔+.4
, ✔✔SI= - ✔✔Tf + pH + Cf + Af - TDSf
✔✔ryznar stability index (RSI) is used to - ✔✔judge how to maintain calcium carbonate
water balance and reduce metal corrosion
✔✔RSI estimates - ✔✔the degree to which calcium carbonate deposits, or scales on
surfaces, or dissolves/corrodes calcium carbonate from the surface
✔✔the most common use of RSI is to - ✔✔minimize metal corrosion through calcium
carbonate's providing a protective coating on the metal surface
✔✔the maximum combined chlorine in a pool is ___ ppm - ✔✔0.2
✔✔the maximum combined chlorine in spas is ___ ppm - ✔✔0.5
✔✔combined chlorine (CC)= - ✔✔total chlorine (TC) - free chlorine (FC)
✔✔free chlorine will react with organic nitrogen, containing contaminants like urea,
amino acids or proteins to produce: - ✔✔organic chloramines (CC)
✔✔treatment methods for reducing chloramines - ✔✔water replacement
breakpoint chlorination (BPC)
ultraviolet (UV)
ozone
potassium monopersulfate
indoor air handling
✔✔breakpoint chlorination (BPC) - ✔✔proccess of adding FC to treat, oxidize or remove
CC
✔✔BPC is effective in removing ___________ chloramines. - ✔✔inorganic
✔✔UV systems are effective at reducing _________ chloramines. - ✔✔inorganic
✔✔ozone is effective at removing - ✔✔inorganic and organic chloramines
✔✔oxidation - ✔✔the process of changing the chemical structure of contaminants so
they are more readily removed from the water
✔✔if the water looks dull or hazy, treating the water with an _________ often helps
improve water clarity - ✔✔oxidizer
✔✔shock/superchlorination products - ✔✔oxidize and disinfect
