pool operators
chloramines are
a combination of chlorine and ammonia in pool water
an aid in removing small particles from the pool water is
a flocculent
cyan uric acid is commonly called
a stabilizer
as dirt in the filter _____ the flow of water going through the filter _____ while filter pressure ____
accumulates, decreases increases
components and materials used for commercial swimming pools spas and hot tubs must comply with what standard
ansi/nspa standard 5
the term for removing dirt particles from the filter is
backwashing
if you see bubbles coming up from a return the possible cause could be
bad seal on hair and linkt strainer
which type of algae inmost difficult to control in a pool, often requiring chlorination and brushing to eliminate
black algae
the chemical name for dry chlorine is
calcium hypochlorite
if the pool is cloudy and you can't see the main drain
close the pool to swimmers
stains on the interior pool surfaces are usually caused by
copper manganese iron
low calcium hardness in the pool water will cause
corrosion of the pool fixtures
what kind of filter media filters out the smallest particles
de
as dirt accumulates inside a filter the amount of water that can pass through the filter
decreases
sodium hypochlorite
deteriorates quickly into exposed air, quickly in sunlight and quickly in high temperature
how do you lower calcium hardness
drain out and add fresh water
pool water must be tested once
every 24 hours
on a pool without a diving bowl no diving tiles must be placed
every 25 feet around the pool
in most jurisdictions the turnover time for a swimming pool is
every 6 hours
cloudy water may be caused by
filter malfunction, excessive bather load, chemical imbalance of pool water
a pool should be free from
floating debris, sediment and dirt, algae
resistance in a pool circulation system is caused by what and whay
friction and head loss
chlorine can be used in which of the following forms
gas liquid powder
chlorine in its natural state is
green
chlorine gas is
heavier than air
microorganisms can be shielded from disinfectants if they are in suspended particles. this situation is caused by
high turbidity levels
chlorine reacts with water to form what disinfectant
hypochlorous acid
chlorine becomes avaialbe to kill bacteria
immediately when added to water
the volume of water going through filter system is measured
in gallon per minute
bromine is sometimes used as a disinfectant because
it is more stable at a higher temperature than chlorine
to lower the ph add
muriatic acid
the hypochlirnator doesn't work what could be a possible cause for this
no chlorine in vat, the injection fitting is clogged and the tube assembly needs to be changed
channeling means
over the course of time the filter and sand is bad and deep channels are formed in the sand causing it to filter poorly
chlorine is used in pool water to not only kill germs but to
oxidize organic matter
what should you use when handling chemicals
personal protective equipment- gloves, goggles apron
when doing the ph test and the sample turns purple
ph is too high
when doing a ph test and the sample turns yellow
ph is too low
handrails should be anchored into the
pool deck and bottom step
algae forms because of
poor circulation
the skimmer weir
precents floating material from re entering the pool
a sequestering agent in a pool may be used to
prevent precipitation of minerals on pool surfaces
what should you have if wage rid deeper than 5 feet
put up a safety line and have a slop line mark
Main drain purpose
remove sediments and is located at the deep end of the pool
high calcium hardness causes
scaling
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
shock the pool with chlorine
to clean a cartridge filter
soaked in degreaser and hosed off
to raise ph what may be adde to the pool
soda ash
to raise the alkalinity level in swimming pool water what chemical is added
sodium bicarbonate
the chemical name for liquid chlorine is
sodium hypochlorite
to becoming a certified pool operator a person must
successfully complete training course in pool operations approved by local jurisdictions
which of the following conditions attribute to accelerated growth of algae in a pool
sunlight hot weather and high bather load
a filter backwash cycle for sand filter is complete when
the backwash water appears clear in sight class
the strongest suction in the pool is
the main drain and the pool must have GFI's
to remove stains from the interior surface of a pool
the pool must be drained and acid washed
filtration is
the process of removing suspend particles form the water
the amount of time that it takes for the total volume of pool water to pass through the circulation system is called
turnover rate
flow rate
turnover rate/ filter media rate
adding liquid or dry chlorine to the pool water has the following effects on ph
will raise the ph
the recommend level of free chlorine in the swimming pool water is
1-5ppm
ideal bromine level in a pool is
1.5 to 6
the pressure differential pressure between gauges on a pressure filter shouldn't exceed
10 psi
to have breakpoint level chlorine at a pool you must have
10 times the level of chloramines
cyanuric acid level cannot exceed
100 ppm
maximum temperature for a spa is
104 f
accodoring to statistics from cdc how many water-related injuries are annually associated with swimming activities
140000
high rate sand filters are abler o filter how much water per minute per square foot
15-25
if a pool has a volume of 75000 gallons and the turnover rate is 8 hours the minimum required flow rate is
156.25 gallons per minute
a shepherds hook must be attached to a
16 foot one piece pole
the volume of water in a rectangular pool is 15 feet wide, 50 feet long and has a constant depth of 3 feet is
16, 830 gallons
minimum number of ladders
2
hardness is a measure of certain dissolved minerals in the water and is recommend to be maintained at
200-400 ppm
the surface areas of the regular swimming pool 30 feet wide and 75 feet long is
2250 square feet
ideal bromine level in a spa
3-10
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
30 minutes
the surface area of a circular wading pool with a diameter of 20 feet is
314 square feet
minimum of ___ of deck around pool perimeter
4
barriers around a pool must be
42 inches in height
the recommend range to maintain ph is
7.2-7.8
alkalinity of swimming pool water is recommended to be maintained at
80-140 ppm