Pool Operators Exam Questions and Answers

Main drain purpose - ANSWER-remove sediments and is located at the deep end of the pool the pressure differential pressure between gauges on a pressure filter shouldn't exceed - ANSWER-10 psi which of the following conditions attribute to accelerated growth of algae in a pool - ANSWER-sunlight hot weather and high bather load chlorine can be used in which of the following forms - ANSWER-gas liquid powder There are complaints of red eyes in the swimmer nd chlorine odors are present. the alkalinity is 100ppm, the harness is 240ppm, the ph is 7.4 and the chine level is 1.0 what should the pool operator do - ANSWER-shock the pool with chlorine to raise ph what may be adde to the pool - ANSWER-soda ash low calcium hardness in the pool water will cause - ANSWER-corrosion of the pool fixtures bromine is sometimes used as a disinfectant because - ANSWER-it is more stable at a higher temperature than chlorine components and materials used for commercial swimming pools spas and hot tubs must comply with what standard - ANSWER-ansi/nspa standard 5 a pool should be free from - ANSWER-floating debris, sediment and dirt, algae a shepherds hook must be attached to a - ANSWER-16 foot one piece pole filtration is - ANSWER-the process of removing suspend particles form the water the volume of water going through filter system is measured - ANSWER-in gallon per minute if a pool has a volume of 75000 gallons and the turnover rate is 8 hours the minimum required flow rate is - ANSWER-156.25 gallons per minute microorganisms can be shielded from disinfectants if they are in suspended particles. this situation is caused by - ANSWER-high turbidity levels the chemical name for dry chlorine is - ANSWER-calcium hypochlorite adding liquid or dry chlorine to the pool water has the following effects on ph - ANSWER-will raise the ph alkalinity of swimming pool water is recommended to be maintained at - ANSWER-80-140 ppm chlorine is used in pool water to not only kill germs but to - ANSWER-oxidize organic matter to becoming a certified pool operator a person must - ANSWER-successfully complete training course in pool operations approved by local jurisdictions handrails should be anchored into the - ANSWER-pool deck and bottom step an aid in removing small particles from the pool water is - ANSWER-a flocculent to clean a cartridge filter - ANSWER-soaked in degreaser and hosed off the amount of time that it takes for the total volume of pool water to pass through the circulation system is called - ANSWER-turnover rate stains on the interior pool surfaces are usually caused by - ANSWER-copper manganese iron the chemical name for liquid chlorine is - ANSWER-sodium hypochlorite the recommend range to maintain ph is - ANSWER-7.2-7.8 to raise the alkalinity level in swimming pool water what chemical is added - ANSWER-sodium bicarbonate chloramines are - ANSWER-a combination of chlorine and ammonia in pool water accodoring to statistics from cdc how many water-related injuries are annually associated with swimming activities - ANSWER- cloudy water may be caused by - ANSWER-filter malfunction, excessive bather load, chemical imbalance of pool water in most jurisdictions the turnover time for a swimming pool is - ANSWER-every 6 hours which type of algae inmost difficult to control in a pool, often requiring chlorination and brushing to eliminate - ANSWER-black algae the recommend level of free chlorine in the swimming pool water is - ANSWER-1-5ppm to lower the ph add - ANSWER-muriatic acid sodium hypochlorite - ANSWER-deteriorates quickly into exposed air, quickly in sunlight and quickly in high temperature resistance in a pool circulation system is caused by what and whay - ANSWER-friction and head loss as dirt accumulates inside a filter the amount of water that can pass through the filter - ANSWER-decreases the surface area of a circular wading pool with a diameter of 20 feet is - ANSWER-314 square feet to remove stains from the interior surface of a pool - ANSWER-the pool must be drained and acid washed chlorine reacts with water to form what disinfectant - ANSWER-hypochlorous acid hardness is a measure of certain dissolved minerals in the water and is recommend to be maintained at - ANSWER-200-400 ppm on a pool without a diving bowl no diving tiles must be placed - ANSWER-every 25 feet around the pool a filter backwash cycle for sand filter is complete when - ANSWER-the backwash water appears clear in sight class chlorine in its natural state is - ANSWER-green chlorine becomes avaialbe to kill bacteria - ANSWER-immediately when added to water cyan uric acid is commonly called - ANSWER-a stabilizer the hypochlirnator doesn't work what could be a possible cause for this - ANSWER-no chlorine in vat, the injection fitting is clogged and the tube assembly needs to be changed you go to the pool in the mooring and notice the chlorine vat is at zero, you hand feed chlorine how long do you have to wait until people to go into the pool - ANSWER-30 minutes a sequestering agent in a pool may be used to - ANSWER-prevent precipitation of minerals on pool surfaces the surface areas of the regular swimming pool 30 feet wide and 75 feet long is - ANSWER-2250 square feet the volume of water in a rectangular pool is 15 feet wide, 50 feet long and has a constant depth of 3 feet is - ANSWER-16, 830 gallons ideal bromine level in a pool is - ANSWER-1.5 to 6 ideal bromine level in a spa - ANSWER-3-10 pool water must be tested once - ANSWER-every 24 hours barriers around a pool must be - ANSWER-42 inches in height minimum of ___ of deck around pool perimeter - ANSWER-4 if you see bubbles coming up from a return the possible cause could be - ANSWER-bad seal on hair and linkt strainer when doing a ph test and the sample turns yellow - ANSWER-ph is too low when doing the ph test and the sample turns purple - ANSWER-ph is too high what should you use when handling chemicals - ANSWER-personal protective equipment- gloves, goggles apron flow rate - ANSWER-turnover rate/ filter media rate how do you lower calcium hardness - ANSWER-drain out and add fresh water what should you have if wage rid deeper than 5 feet - ANSWER-put up a safety line and have a slop line mark what kind of filter media filters out the smallest particles - ANSWER-de the strongest suction in the pool is - ANSWER-the main drain and the pool must have GFI's the skimmer weir - ANSWER-precents floating material from re entering the pool algae forms because of - ANSWER-poor circulation minimum number of ladders - ANSWER-2 if the pool is cloudy and you can't see the main drain - ANSWER-close the pool to swimmers high calcium hardness causes - ANSWER-scaling channeling means - ANSWER-over the course of time the filter and sand is bad and deep channels are formed in the sand causing it to filter poorly as dirt in the filter _____ the flow of water going through the filter _____ while filter pressure ____ - ANSWER-accumulates, decreases increases the term for removing dirt particles from the filter is - ANSWER-backwashing high rate sand filters are abler o filter how much water per minute per square foot - ANSWER-15-25 to have breakpoint level chlorine at a pool you must have - ANSWER-10 times the level of chloramines maximum temperature for a spa is - ANSWER-104 f cyanuric acid level cannot exceed - ANSWER-100 ppm chlorine