Pool Operator's Final Exam question
and answers
Thed3percentaged3ofd3hypoclorousd3acidd3formationd3isd3mostd3influencedd3by:d3-
d3ans✔pH
Poold3paintingd3isd3usuallyd3done:d3-d3ans✔Befored3openingd3ind3thed3spring
Whend3ad3poold3isd3chlorinatedd3withd3gasd3chlorine,d3thed3operatord3mustd3alsod3use:d3-
d3ans✔Sodad3Ash
Thed3termd3"chlorined3demand"d3refersd3to:d3-
d3ans✔Thed3amountd3ofd3chlorined3whichd3willd3reactd3withd3substancesd3ind3thed3pool
Re-circulationd3pumpsd3usedd3ind3swimmingd3poolsd3ared3thed3typed3called:d3-
d3ans✔Centrifugald3pumps
Reversingd3thed3flowd3ofd3waterd3throughd3thed3filtersd3isd3called:d3-d3ans✔Backwash
"Slurryd3feed"d3ord3"bodyd3feed"d3refersd3to:d3-
d3ans✔Diatomited3addedd3duringd3ad3filterd3run
Thed3termd3pHd3isd3determinedd3byd3thed3concentrationd3of:d3-d3ans✔Hydrogend3ions
Becaused3carbonated3ionsd3combined3withd3hydrogend3ions,d3sodiumd3carbonated3willd3c
aused3pHd3to:d3-d3ans✔Rise
Whend3enoughd3chlorined3isd3addedd3tod3caused3completed3oxidationd3ofd3alld3organicd3
compounds,d3ad3suddend3dropd3ind3residuald3chlorined3mayd3bed3noticed.d3Thed3pointd3a
td3whichd3thisd3occursd3isd3calledd3the:d3-d3ans✔Break-point
"Residuald3chlorine"d3refersd3to:d3-
d3ans✔Thed3amountd3leftd3ind3thed3waterd3afterd3oxidationd3ofd3organicd3material
, Whichd3ofd3thed3followingd3isd3NOTd3consideredd3ad3swimmingd3poold3disinfectant:d3-
d3ans✔Chlorinatedd3hydrocarbons
Whend3chlorined3isd3usedd3asd3ad3disinfectantd3ford3swimmingd3pools,d3thed3formd3ind3w
hichd3it'sd3disinfectantd3propertiesd3ared3thed3greatestd3is:d3-d3ans✔Hypochlorousd3acid
Thed3chemicald3mostd3commonlyd3usedd3tod3raised3pHd3is:d3-d3ans✔Sodiumd3carbonate
And3exampled3ofd3ad3chemicald3usedd3tod3stabilized3chlorined3is:d3-d3ans✔Cyanuricd3acid
Thed3chemicald3reagentd3recommendedd3byd3thed3healthd3departmentd3tod3testd3chlorin
ed3residuald3ind3swimmingd3poolsd3is:d3-d3ans✔D.P.D.
Thed3chemicald3reagentd3usedd3mostd3oftend3tod3testd3pHd3ind3swimmingd3poolsd3is:d3-
d3ans✔Phenold3red
Consideringd3alld3factors,d3whichd3ofd3thed3followingd3wouldd3bed3thed3BESTd3ranged3for
d3pHd3ind3ad3swimmingd3pool:d3-d3ans✔7.2-7.8
Thed3minimumd3turnoverd3rated3tod3obtaind3100%d3clarityd3ind3ad3poold3is:d3-
d3ans✔Onced3ind3eightd3hours
Thered3isd3ad3noticeabled3odord3ofd3chlorined3aroundd3yourd3poold3andd3bathersd3ared3co
mplainingd3ofd3eyed3irritation.d3Whichd3ofd3thed3followingd3isd3mostd3likelyd3tod3solved3the
d3problem:d3-d3ans✔Breakd3pointd3chlorination
Asd3pHd3increases,d3chlorined3effectiveness:d3-d3ans✔Decreases
Ind3ad3high-rated3sandd3filterd3system,d3thed3tanksd3ared3backwashed:d3-
d3ans✔Alld3atd3once
Thed3baffled3ind3thed3filterd3tankd3isd3thered3to:d3-
d3ans✔Dispersed3waterd3evenlyd3overd3thed3surfaced3ofd3thed3filterd3media
And3accessd3manholed3isd3constructedd3ond3eachd3tankd3ind3sandd3andd3anthracited3filte
rd3systems:d3-d3ans✔Alld3ofd3thed3above
Ad3haird3andd3lintd3strainerd3shouldd3bed3located:d3-
d3ans✔Befored3thed3pumpd3andd3befored3thed3filter
Sodiumd3hypochlorited3usedd3asd3ad3poold3sanitizerd3alsod3affectsd3thed3waterd3pHd3ind3t
hed3followingd3manner:d3-d3ans✔Raises
Chlorined3gasd3willd3________d3thed3pH:d3-d3ans✔Lower
DEd3systemsd3shouldd3bed3turnedd3offd3ford3ad3"rest":d3-d3ans✔Never
and answers
Thed3percentaged3ofd3hypoclorousd3acidd3formationd3isd3mostd3influencedd3by:d3-
d3ans✔pH
Poold3paintingd3isd3usuallyd3done:d3-d3ans✔Befored3openingd3ind3thed3spring
Whend3ad3poold3isd3chlorinatedd3withd3gasd3chlorine,d3thed3operatord3mustd3alsod3use:d3-
d3ans✔Sodad3Ash
Thed3termd3"chlorined3demand"d3refersd3to:d3-
d3ans✔Thed3amountd3ofd3chlorined3whichd3willd3reactd3withd3substancesd3ind3thed3pool
Re-circulationd3pumpsd3usedd3ind3swimmingd3poolsd3ared3thed3typed3called:d3-
d3ans✔Centrifugald3pumps
Reversingd3thed3flowd3ofd3waterd3throughd3thed3filtersd3isd3called:d3-d3ans✔Backwash
"Slurryd3feed"d3ord3"bodyd3feed"d3refersd3to:d3-
d3ans✔Diatomited3addedd3duringd3ad3filterd3run
Thed3termd3pHd3isd3determinedd3byd3thed3concentrationd3of:d3-d3ans✔Hydrogend3ions
Becaused3carbonated3ionsd3combined3withd3hydrogend3ions,d3sodiumd3carbonated3willd3c
aused3pHd3to:d3-d3ans✔Rise
Whend3enoughd3chlorined3isd3addedd3tod3caused3completed3oxidationd3ofd3alld3organicd3
compounds,d3ad3suddend3dropd3ind3residuald3chlorined3mayd3bed3noticed.d3Thed3pointd3a
td3whichd3thisd3occursd3isd3calledd3the:d3-d3ans✔Break-point
"Residuald3chlorine"d3refersd3to:d3-
d3ans✔Thed3amountd3leftd3ind3thed3waterd3afterd3oxidationd3ofd3organicd3material
, Whichd3ofd3thed3followingd3isd3NOTd3consideredd3ad3swimmingd3poold3disinfectant:d3-
d3ans✔Chlorinatedd3hydrocarbons
Whend3chlorined3isd3usedd3asd3ad3disinfectantd3ford3swimmingd3pools,d3thed3formd3ind3w
hichd3it'sd3disinfectantd3propertiesd3ared3thed3greatestd3is:d3-d3ans✔Hypochlorousd3acid
Thed3chemicald3mostd3commonlyd3usedd3tod3raised3pHd3is:d3-d3ans✔Sodiumd3carbonate
And3exampled3ofd3ad3chemicald3usedd3tod3stabilized3chlorined3is:d3-d3ans✔Cyanuricd3acid
Thed3chemicald3reagentd3recommendedd3byd3thed3healthd3departmentd3tod3testd3chlorin
ed3residuald3ind3swimmingd3poolsd3is:d3-d3ans✔D.P.D.
Thed3chemicald3reagentd3usedd3mostd3oftend3tod3testd3pHd3ind3swimmingd3poolsd3is:d3-
d3ans✔Phenold3red
Consideringd3alld3factors,d3whichd3ofd3thed3followingd3wouldd3bed3thed3BESTd3ranged3for
d3pHd3ind3ad3swimmingd3pool:d3-d3ans✔7.2-7.8
Thed3minimumd3turnoverd3rated3tod3obtaind3100%d3clarityd3ind3ad3poold3is:d3-
d3ans✔Onced3ind3eightd3hours
Thered3isd3ad3noticeabled3odord3ofd3chlorined3aroundd3yourd3poold3andd3bathersd3ared3co
mplainingd3ofd3eyed3irritation.d3Whichd3ofd3thed3followingd3isd3mostd3likelyd3tod3solved3the
d3problem:d3-d3ans✔Breakd3pointd3chlorination
Asd3pHd3increases,d3chlorined3effectiveness:d3-d3ans✔Decreases
Ind3ad3high-rated3sandd3filterd3system,d3thed3tanksd3ared3backwashed:d3-
d3ans✔Alld3atd3once
Thed3baffled3ind3thed3filterd3tankd3isd3thered3to:d3-
d3ans✔Dispersed3waterd3evenlyd3overd3thed3surfaced3ofd3thed3filterd3media
And3accessd3manholed3isd3constructedd3ond3eachd3tankd3ind3sandd3andd3anthracited3filte
rd3systems:d3-d3ans✔Alld3ofd3thed3above
Ad3haird3andd3lintd3strainerd3shouldd3bed3located:d3-
d3ans✔Befored3thed3pumpd3andd3befored3thed3filter
Sodiumd3hypochlorited3usedd3asd3ad3poold3sanitizerd3alsod3affectsd3thed3waterd3pHd3ind3t
hed3followingd3manner:d3-d3ans✔Raises
Chlorined3gasd3willd3________d3thed3pH:d3-d3ans✔Lower
DEd3systemsd3shouldd3bed3turnedd3offd3ford3ad3"rest":d3-d3ans✔Never
