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CPO CERTIFIED POOL OPERATOR EXAM 2026/2027| Water Chemistry, Filtration and Safety Q&A | Pass

PHYS100 Physics — exam and revision material · Other

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Physics exam material, 11 pages. Originally published on StudyMerit.

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11
Academic year
2025/2026
Language
English

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GPO Certfwa Pool Cperacr Ssam 24928 1060 Quegtons | FHTA Sunday 100 Multipie-Choice Questions | PHTA Cumiculum Standards | MAHC Aligned Ths prachion sasmruioe § Sigel am Te JOOS 207 Poot ang bat Tub Alteroe (FHTA) Cortifes Foot Oper SRT STDAM Fu Wo AB Hom Cote MANC | regimes Section 1: Water Chemistry (Questions 1-25) 1. What is the PHTA-recommended acceptable mange for swimming pool pH? Ab6E-72 B,7.2- 7.5 [CORRECT] C 748-82 D.KO-84 Correct Answer: 8 Rathnnaler The PETA CPO curricubum sprition » pbl range of 7.2 00 7% fon swing poole. This enngr opiate chiar ime withsey, tthe confor, sd squint engrrity, Vile cute tus cange con caw yw MTation, conion, or saling 2. A pool operator tests the water aod Cindy & pH of 6.5 and total alkalinity of 40 ppan. Which chemical adjustment should be nude FIRST? A. Add sodium hypochlorite to raise pH Be Add sodium bicarbonate 10 rare total alkalinity [CORRECT] € Add muriatic achd to lower pH D. Add calcium chloride Jo mise calcium hardness Correct Answer: 8 Rustbomobet Total atkinbininy ace os 4 buffer (on ph send set Se commcred Get. Wish TA ar only 40 ppm (below the %0.120 ppm Adenby, the pb will comme wo drift. Rassang TA woh soli bucartmste sidalines pl Sofie aakong farther sd justin A According to PHTA standards, what is the deal total alkalinity range for a standard swimming pool? AL 40 - 60 ppm B60 - 80 ppm C. $0 - 120 ppm [CORRECT] D. 120 - 180 ppm Correct Answer: C Rationale: PHTA recommends a setal slkalini cage of 40% 120 pow for commemtional ew imming poods This tinge provides adeyriate butiering Grpmony to prevent rxpnd pH tha estnan while mssntamng wate: balance 4. What is the primary purpose of Wotal alkalinity in pool water chemistry? A. To kill bacteria and viruses Page 1

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CPO Cert Poot Opatcs Exam 2008 106 Quewtons | FHTA Bandas B. To act as a pH buffer and prevent mpid pH changes [CORRECT] C. To remove suspended particles from the water D. To increase water hardness and prevent corrosion Correct Answer: B Rutionule: Tota! afkafiury serves a the primey buffes system im poot water, cessing changes in pH caused by futher Joad. chemical sddition, sd envinmeyental facies. Withoos adequate TA. pH cae veg Samasscally. meking wales mmsg=inent difficut. 5. A pool has a calcium hardness level of 150 ppm. Which condition is most likely 10 occur if this level is not corrected? A. Scaling va pool merfaces and equipment B. Corrosion of plaster. metal fismres, and equipment [CORRECT] C. Rupid algae growth D. Chlorine hock due to high cynnanc acid Correct Answer: B Rattunale: Low calemm hardier (rk the PHTA. recomasaded 206.300 ppm) aubes wane aggresive ad consis. The water will vich pastes srfiuces, comin mend compote snd dimmidve cacti (mn gin und concern 6. The Langelier Saturntion fedex (LS) cakoulates water balance uit which five facton? A. pH, TA, CH. temperature. and TDS [CORRECT] B. pH, free chlorine, combined chiorine, temperature, sd TDS ©. pH. TA, cyanuric acid. temperature, and phosphate level D. pH. TA, CH. free chlorme, and alkalinity Correct Answer: A Rautbonnber Thee 83 wees ph. sonal alhadinery. cobs hasbnew. water toamperssre. and soul dimotved sodids ie deswrmine whether wien in Balanced. correnive Degas LSTA or scaling (posse LST1 An LSI erwwen 0.3 und +03 bs considered tialanced. 7. An LS! value of 0.8 indicates which water condition? A. Perfectly halinced water B. Scale-forming water C. Corrosive water (CORRECT) D. Saturated water Correct Answer: C Rutivmaber A megane LST value hake OF undicaten comers water dat will ammch powl sa faoes, sgaepenent. and livres. An LS1 of 0K in wgmif icaimly coeremive sid regres comective sctim sch os incressing pH. sliodinie. or culcius hardiess 8. What test is used to measure pH in pool water, and what is its effective range? A. DPD test, effective from 0.5 to 5.0 ppm chlorine B, Phenol Red test, effective from 6.5 10 §.2 pH [CORRECT] COTO test. effective from 7.010 8.5 pH 1D. Turbidity test, effective from 6.0 109.0 pH Correct Answer: B Rationale: The Pheool Red indantor test in the standard method for messsring pool weer pH It prorvades uccarute tending in ibe 6.8 108.2 runge, which covers the fill PHT A crcommendad opessitng range of 7290 74 9.1 total dissolved solids (TDS) exceed 1.500 ppm above the starting TDS. what action is recommended ? A. Add more chlorine to compensate Pagel

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CPO Gertsied Pool Opera Samm 1008 100 Duewtons | FHTA Gandards B. Drain and replace a portion of the pool water [CORRECT] C. Increase the filtration rte D. Add a sequestering agent to dissolve solids Con A i Rationale: PHT A guidelines recommend desising sed replaces 2 portion of pool water when TIS exceeds 1.500 ppm above the surtup TDN fevel High TDS reduces saisiees sffectivensss, comes cloady water. and can lend 10 wee and odor problems. 10, Which chemical is used to mise total alkalinity is 2 swimming pool?! A. Sodium hisulfate B. Sodium bicarbonate [CORRECT] C. Calcium hypochlorite D. Musiatic acid Correct Answer: B Rationale: Soden mos bona (habing sade. NaHUOH) 0 fo sundend cdemacd for comng otal alkabinery, | creases TA with mattimal impact on pH. making i weal for TA sosrections wise descally stirnng the gh level 11. A pool operator needs w lower pH from 8.2 0 7.5, Which chemical is the most appropriate choice? A. Sodium bicarbonate B. Sodium carbonate (soda ash) ©. Muriatic acid or sodinm buultate [CORRECT] D. Calcium chloeide Correct Answer: C Rutionuber Murase sci (rypdrochiboric soul) or sont bills (Sry scill my the twa grimy cliesnicats med 10 lower pH Tosh are effective, though miemtie acnd 1 more commonly ww = comemeroaal posl speracionn Sar wit Ws co er dose 12. What is the PHT A-recomsended cakiom hardness range for a plaster pool? A. 100-200 ppm B, 200 - 400 ppm [CORRECT] CAO - 600 pp 0. 50 150 ppes Correct Answer: B Rattan; The FID res sovsra nls snasmmmmng + le sawn Sum dren bovwaws 200 amd S00 py (mn phusive prose Ths tune reneats die plasiire witliiee iti ex hang snl §enremem w bile pers ammng «army ab sms osbe Linthatees TX. How does wales temperiure wllect the Langelier Sshuration ladex® A Higher emperitures decree the tendency io sale B. Higher remperatiers inresse the jendescy wioacsle [CORRECT] © Temperature bas no cf fod om the LSI D Losey trmperammess iscrene the kedersy wo wade Carre) Asswar: B Waid iwtrade 14 |

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