Pool Operator Exam Questions and Answers Updated 2026/2027 Version | Verified Answers

Pool Operator Exam Questions and Answers Updated 2026/2027 Version | Verified Answers 1. low pH leads to (3) - ANSWER corrosive water, surface staining, surface etching 2. if you have low pH, you must add - ANSWER soda ash (caustic soda - sodium carbonate) 3. high pH leads to (5) - ANSWER scaling water, cloudy water, clogged filters, reduced circulation, eye/skin irritation 4. if you have high pH, you must add ____ or _____ - ANSWER muriatic acid, sodium bisulfate 5. whole range of total alkalinity: ____ to _____ - ANSWER 60, 180 6. ideal range(s) of total alkalinity: ____ to _____ - ANSWER 80, 120 7. the measure of the ability of the water to resist change in pH - ANSWER total alkalinity 8. acts as a pH buffer - ANSWER total alkalinity 9. _____ will affect total alkalinity - ANSWER cyanuric acid 10. if your pH is high, you will require a ______ total alkalinity - ANSWER lower 11. if your pH is low, it is acceptable to have a ______ total alkalinity - ANSWER higher 12. low total alkalinity leads to (4) - ANSWER pH bounce, heater failure, surface etching, green water 13. if you have low total alkalinity, add ______ - ANSWER sodium bicarbonate 14. how much sodium bicarbonate should be added to increase total alkalinity? - ANSWER 1.4 pounds per 10000 gal of water 15. high total alkalinity leads to (4) - ANSWER pH lock, cloudy waters, clogged filters, reduced circulation 16. if you have high total alkalinity, add _____ or ______ - ANSWER muriatic acid, sodium bisulfate 17. whole range for calcium hardness in a pool: ____ to ____ - ANSWER 150, 1000 18. ideal range of calcium hardness in a pool: ____ to ____ - ANSWER 200, 400 19. whole range of calcium hardness in a spa: ____ to ____ - ANSWER 100, 800 20. ideal range of calcium hardness in a spa: ____ to ____ - ANSWER 150, 250 21. amount of calcium content in the water - ANSWER calcium hardness 22. calcium hardness is measured as ______ - ANSWER calcium carbonate (CaCO3) 23. calcium not in solution (as a solid) is called _____ - ANSWER scale 24. calcium hardness is affected by _______ - ANSWER temperature 25. when temp rises, calcium hardness becomes ______ - ANSWER less soluble 26. low calcium hardness leads to (3) - ANSWER corrosive water, wall stains, heater failure 27. if you have low calcium hardness, add - ANSWER calcium chloride 28. high calcium hardness leads to (3) - ANSWER scale, cloudy water, clogged filters 29. the only way to lower calcium hardness is to _____ - ANSWER partially drain the water and replace it 30. max temperature of a pool or spa - ANSWER 104 degrees 31. at higher temps, there is an increased tendency for _____ - ANSWER scaling 32. at lower temperatures, there is an increased tendency for ______ - ANSWER corrosion 33. maximum total disolved solids - ANSWER 1500 34. saturation index equation: SI= - ANSWER pH + TF + CF + AF + TDSF 35. green water - ANSWER presence of copper 36. red-brown water - ANSWER presence of iron 37. number one reason for cloudy water - ANSWER improper filtration 38. too much calcium in the water leads to - ANSWER scale