Hardness in water - Study guides, Class notes & Summaries

Certified Pool Operator Exam (2024/ 2025 Update) Questions and Verified Answers| 100% Correct | A Grade QUESTION Maximum H20 temperature for a spa is 120 degrees. Answer: False QUESTION A salt chlorine generator creates gas chlorine inside the pool plumbing. Answer: False QUESTION The allowable range for calcium hardness is 20-400ppm. Answer: False QUESTION When testing a water sample, you should take the water sample from the surfac...

How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of steam? - correct answer 7 feet On a gas fired boiler what is the proper gas to air mixture - correct answer 30%-70% and in special arrangements it can be as high as 100% . ANSWER CHAPTER 11 remember% What is the total hardness in a system that was found to have calcium hardness of 60ppm and magnesium hardness of 18ppm and carbon hardness of 12 ppm? - correct answer TH=(Ca x 2.5) + (Mg x 4.1)...

State Agency responsince for enforcing the safe drinking water act in Texas Texas Commission on environmental Quality What minerals can cause water hardness Calcium and magnesium A public water system must at all times provide Adequate quantity of water, pressure, and disinfection A source groundwater would be aquifer Fecal coliform organisms sometimes found in water supplies are an indication that Water supply is contaminated, harmful bacteria may be present, possible pathogenic organi...

Gases of Combustion that cool on Contact with the boiler heating Surface before combushion is completed Cause a(n) _________ correct answer: Formation of soot and smoke In the event of a flame failure, the programmer will______ correct answer: Secure the fuel, purge the firebox, and then shut down Boil the water must be conditioned to prevent ______ (3 Answers) correct answer: Formation of scale, oxygen pitting, carryover Rank refers to the __________ of the coal correct answer: Deg...

To be a pool operator you must - ANSWER-Complete a pool operator training course To prevent spinal injury - ANSWER-All of the above The strong suction in the pool (ENTRAPMENT) is the - ANSWER-Main Drain Electrical systems in the pool must have - ANSWER-GFIs (Ground Fault Circuit Interrupters?) The skimmer _____ prevents floating debris from re-entering the pool - ANSWER-WEIR What is filtration? - ANSWER-Physical process of water moving through the system What is the turnover ra...

ABSA: 4th Class Part B - Comprehensive Exam 1 Questions with Complete Solutions 2024/2025 Temporary hardness in feedwater is caused by: Select one: a. Magnesium sulphate b. Calcium carbonate c. Magnesium bicarbonate d. Sodium nitrate - Correct Answer c What is the recommended boiler water pH for wet layup? Select one: a. 10 b. 12 c. 7.5 d. 7 - Correct Answer a A photoelectric flame scanner: Select one: a. Produces a steady voltage signal b. Requires a clear line of sigh...

It's in the middle of the summer & you're having a breakdown in the coagulation process in your up-flow clarifier due to algae, this problem occurs only in the late afternoon with periods of good operation before and after. What changes should you make during the problem periods to improve the finish water quality? - AnswerReduce the sludge blanket depth The inorganic compounds (ie. Iron) are effectively removed from your raw water using aeration. Test indicate an increasing taste and odor ...

First step of fecal accident procedure - ANSWER-Direct all bathers to leave the pool. All affected waters must be closed to swimming until proper procedures for contamination have been completed Second step of fecal accident procedure - ANSWER-Manually remove as much of the material as possible using a net or scoop and dispose of it in a sanitary manner. Clean and disinfect the scoop or net. After cleaning leave the net or scoop immersed in the pool during this infection. Vacuuming the stool ...

Stationary Engineer Exam Questions And Answers How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of steam? - ANS 7 feet On a gas fired boiler what is the proper gas to air mixture - ANS 30%-70% and in special arrangements it can be as high as 100% . ANSWER CHAPTER 11 remember% What is the total hardness in a system that was found to have calcium hardness of 60ppm and magnesium hardness of 18ppm and carbon hardness of 12 ppm? - ANS ...

Which disinfectant would work best against cryptosporidium ozone dichloramine hypochlorite ion hypochlorous ion ozone The pH of a water sample is greater than the pHs, so the Langelier index? indicates the water is corrosive is negative indicates the water is scale forming indicates the water is stable indicates the water is scale forming When water high in calcium bicarbonate is softened by ion exchange all cations and anions are removed regeneration is usually accomplished by an ...