Pool Operator Final Examination Study Guide - Complete Verified Answer Set

Pool Operator Final Examination Study Guide - Complete Verified Answer Set whole range chlorine in a pool: ____ to _____ - answer - 1, 5 ideal range chlorine in a pool: ____ to _____ - answer - 2, 4 whole range chlorine in a spa: ____ to _____ - answer - 2, 10 ideal range chlorine in a spa: ____ to _____ - answer - 3, 5 4 types of solid chlorine - answer - calcium hypochlorite, lithium hypochlorite, trichlor, dichlor liquid chlorine - answer - sodium hypochlorite (NaOCl) how active is gas chlorine - answer - 100% the active killing form of chlorine in water - answer - hypochlorous acid (HOCl) HOCl = ______ - answer - H+ (hydrogen ion) + OCl- (hypochlorite ion) most common granular chlorine (pH range) - answer - calcium hypochlorite (8.5 - 11, used to super chlorinate water) not common form of chlorine due to low active strength (pH) - answer - lithium hypochlorite (10.8) tablet/stick chlorine usually used in erosion feeder (pH - what will it do?) - answer - trichlor (2.8 - 3.5, lower alkalinity and pH over time) salt used as a disinfectant (pH) - answer - dichlor (6.7 - common in vinyl lined pools) most common type of chlorine used (pH) - answer - sodium hypochlorite (NaOCl - 13) ______ needs special training to use and has a pH of ____ and will _____ when added to water - answer - gas chlorine, 0, lower pH chlorine is most effective as a pH of _____ - answer - 7.5 active disinfectant in the water - answer - free chlorine (FC) FC is determined by the ______ test and is maintained between ____ and ____ ppm - answer - DPD, 2, 4 equal to the amount of hypochlorous acid (HOCl) and the amt of hypochlorite ions (OCl-) - answer - free chlorine (fc) the result of free chlorine reacting with organic compounds - answer - combine chlorine (CC) common name and max for pools and spas for combine chlorine - answer - chloramines, 0.2, 0.5 CC = - answer - TC - FC what will a DPD measure - answer - TC, FC how much CC should a pool have ideally - answer - zero shocking the pool is also called - answer - breakpoint chlorination breakpoint chlorination is the conversion of ________ into ______ - answer - combine chlorine, nitrogen gas breakpoint chlorination equation - answer - BPC = 10 x CC [BPC = 10 x (TC - FC)] whole cyanuric acid range: _____ to ______ppm - answer - 0, 100 ideal cyanuric acid range: _____ to ______ ppm - answer - 30, 50 acts as a protection for chlorine compounds from UV light - answer - cyanuric acid CyA will act as a stabilizer for _______ but does not stabilize ________ - answer - free chlorine, bromine The only way to reduce CyA concentration is to _______ - answer - dilute the water and replace it whole range of bromine: ____ to _____ - answer - 2, 10 ideal range of bromine: _____ to ______ - answer - 4, 6 second most common disinfectant in the pool - answer - bromine two types of bromine used - answer - sodium bromide, solid bromide Bromine in natural form is a ______ but is in _____ form when added to pools - answer - reddish brown liquid, solid __________ is similar to hypochlorous acid - answer - hypobromous acid bromine releases _____ and _____ when added to water - answer - hypobromite ion, hydrogen ion bromine will ______ pH when added to water - answer - lower whole range of pH: ____to_____ - answer - 7.2, 7.8 ideal range of pH: ____ to ____ - answer - 7.4, 7.6 things that influence pH (6) - answer - swimmer waste, disinfectants, water source, air borne debris, chemical balance, evaporation low pH leads to (3) - answer - corrosive water, surface staining, surface etching if you have low pH, you must add - answer - soda ash (caustic soda - sodium carbonate) high pH leads to (5) - answer - scaling water, cloudy water, clogged filters, reduced circulation, eye/skin irritation if you have high pH, you must add ____ or _____ - answer - muriatic acid, sodium bisulfate whole range of total alkalinity: ____ to _____ - answer - 60, 180 ideal range(s) of total alkalinity: ___