Aquatic Facility Operator Exam: Questions and Answers, Exams of Business Administration

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Aquatic Facility Operator Exam

Questions and Answers

What is NOT one of the AFO's primary responsibilities? Teaching Lessons What should you do every day as a part of your AFO safety duty program? Facility Inspection How many gallons of water is in one cubic ft? approximately 7. How do you calculate how many gallons are in a pool?

1. calculate the volume (LxW)xDavg
2. multiple by 7.5 gallons Law of Dilution During a turnover less than half of the water molecules pass through the filter What kind of pools need a higher turnover? Special pools When do gutters NOT work? when flooded What do surge pits need? room to contain surge flow What do modulating float valves regulate? the amount of water contributed by the bottom outlet by slowly restricting the bottom drain valve as the water level in the surge pit rises What are the two types of pumps? Self-Priming and Flooded Suction Centrifugal 4 inches = 400 gpm What does eliminating dead spots mean? Heated and treated water is equally distributed in the pool Horizontal High Rate Sand Filter increases surface area

When do you backwash? When the pressure differential indicates it is needed When do you body feeding (DE)? during the filter cycle What is oxidation? a chemical process that destroys organic compounds in the pool water What is disinfection? the chemical process that kills or deactivates pathogens What does oxidation do? destroys organics What does sanitation do? destroys bacteria What does poor oxidation result in? cloudy turbid water What is the desirable chlorine compound? HOCl Why is HOCl the desirable chlorine compound? because it oxidizes AND sanitizes When is HOCl produced? Upon gas chlorine, sodium hypochlorite (bleach) or calcium hypochlorite being added to water pH of soda ash dissolved in water pH 13+ Safety considerations for chemical handling require what? eye wash station When are chloramines formed? under a heavy organic load with low chlorine levels, often with limited air movement How do you get rid of chloramines? you super chlorinate How do you obtain combined chlorine? (TC)-(FC) = combined chlorine How do you calculate breakpoint calculation? multiply CC by 10 What should you always do when handling chemicals? wear protective equipment For CSI, what does negative/positive mean Negative = aggressive Positive = scaling

What is the most influential variable in the CSI? pH What is the maximum spa temperature and for how long? 104 degrees for 15 minutes What is total Alkalinity? this is an index of the water's resistance to pH change What is the best recommendation for CH levels in pools? 300 - 600ppm Why are pool heaters prone to scale? because calcium carbonate is more likely to form on elevated temperatures with automation, why are large feed system important? In order to meet set points quickly What is the most important factor related to pool water chemistry? pH What should you automate if you can only afford to automate one? pH What do typical chemical controllers measure? ORP and pH What do chemical controllers NOT replace? pool operator What is oxidation reduction potential (ORP)? qualitative measure of chlorine's work value (how well it's working) What is the standard minimum ORP for virtually instantaneous pathogen deactivation? 650mV What can an acid demand test tell you? used to determine how much muriatic acid must be added to high pH water to reach a desired value In a DPD test, what does a flash of pink and then clear tell you? Cl2 residual is very high Acid wash is what? damaging last resort Water cloudiness can be due to what? precipitation of calcium What are polymers? liquid filter acids What do enzymes do? digest body fluids and oily polymers