AQUATIC FACILITY OPERATOR TEST PAPER 2025
QUESTIONS WITH SOLUTIONS RATED A+
✔✔Chlorine Dioxide (CIO2) - ✔✔A synthetic, green-yellowish gas that has strong
oxidation and disinfection potential.
✔✔Chlorine Residual - ✔✔Amount of available chlorine remaining in pool water after
the chlorine demand has been satisfied.
✔✔Circulation - ✔✔A term representing the reoccurring flow of water through a filter or
pumping system
✔✔Clarity - ✔✔The degree of transparency of pool water, sometimes expressed as
National Turbidity Units (NTU)
✔✔Coagulation - ✔✔The neutralization of the charges of suspended colloidal mater
resulting in clumping; sometimes also call flocculation.
✔✔Combined Chlorine (See also Chloramine) - ✔✔Chlorine that is combined with
another substance, usually ammonia, to produce chloramines. combined chlorine is
much less effective than "free" chlorine.
✔✔Conductivity - ✔✔A measurement of water's ability to conduct electricity and is used
to indicate the amount of dissolved solids in the water. Typically measured in micro
Siemens (mS)
✔✔Condensing-Type Pool Heaters - ✔✔A high-efficiency heater that makes use of the
condensate created by the burning of gas that allows for latent heat to be collected from
the vaporization from the water. Achieves approximately 95% efficiency.
✔✔Cyanuric Acid (CYA) - ✔✔1,3,5-triazine-2,4,6-triol; also known as stabilizer or
conditioner. Slows the destruction of chlorine in pool water by sunlight. Also reduced the
effectiveness of chlorine.
✔✔Diaphragm Pump (See also Chemical Feeder) - ✔✔Chemical feeder of the positive-
displacement type using a flexible membrane to move liquid through the pump head.
✔✔Diatomaceous Earth (D.E.) - ✔✔White powder composed of fossilized skeletons of
one-celled organisms (diatoms). Used as a filter medium for swimming pools.
✔✔Dichlor - ✔✔Sodium dichloroisocyanurate; a stabilized form of granular chlorine.
Usually 62% chlorine by weight and a pH of ~7 in water.
, ✔✔Disinfection - ✔✔The process by which disease-causing organisms are killed or
inactivated.
✔✔Equalizer Line - ✔✔A plumbing line from below the pool surface to the body of a
skimmer that prevents air from being drawn into the pump.
✔✔Erosion Feeder - ✔✔A chemical-feed device that creates a chlorine solution by
eroding granular, tablet, or pelletized forms of chlorine by flowing water past or spraying
water on the product.
✔✔Eye Burn - ✔✔A pool term describing irritation of the eyes due to rinsing off of the
external eye fluid or by chloramines.
✔✔Eviseration - ✔✔A medical term for damage to a person's digestive track caused by
suction of an uncovered or unprotected bottom drain.
✔✔Feet or Head - ✔✔A basic measurement of resistance to flow in a hydraulic system -
- equivalent to the height of a column of water that would cause the same
resistance/pressure.
✔✔Filter Cartridge - ✔✔A pleated element, usually of fibrous material, used as a filter
septum in some pool filters with a recommended filter rate of 1-2 gpm/ft2
✔✔Filter Cycle (Filter Run) - ✔✔The time of filter operation between backwash
procedures.
✔✔Filter Diffuser - ✔✔A shower-head-like device inside the top of a sand-filter tank
attached to the influent piping -- distributes the water evenly over the top of the sand
bed.
✔✔Filter Element - ✔✔A filter cartridge, or that single part of a multiport diatomite filter,
upon which the filter media is deposited.
✔✔Filter Media - ✔✔Any fine-grain material that entraps suspended particles as water
passes through.
✔✔Filter Septum - ✔✔That part of a filter on which D.E. or similar filter media is
deposited -- consisting of clotch, wire screen, or other fine mesh material.
✔✔Float Valve - ✔✔A valve controlled by the level of a fluid. Typically associated with
autofill systems that regulate freshwater fill or chemical-tank-level controls.
✔✔FLOC or Flocculate - ✔✔The process of agglomerating coagulated particles into
settleable flocs, usually of a gelatinous nature.
QUESTIONS WITH SOLUTIONS RATED A+
✔✔Chlorine Dioxide (CIO2) - ✔✔A synthetic, green-yellowish gas that has strong
oxidation and disinfection potential.
✔✔Chlorine Residual - ✔✔Amount of available chlorine remaining in pool water after
the chlorine demand has been satisfied.
✔✔Circulation - ✔✔A term representing the reoccurring flow of water through a filter or
pumping system
✔✔Clarity - ✔✔The degree of transparency of pool water, sometimes expressed as
National Turbidity Units (NTU)
✔✔Coagulation - ✔✔The neutralization of the charges of suspended colloidal mater
resulting in clumping; sometimes also call flocculation.
✔✔Combined Chlorine (See also Chloramine) - ✔✔Chlorine that is combined with
another substance, usually ammonia, to produce chloramines. combined chlorine is
much less effective than "free" chlorine.
✔✔Conductivity - ✔✔A measurement of water's ability to conduct electricity and is used
to indicate the amount of dissolved solids in the water. Typically measured in micro
Siemens (mS)
✔✔Condensing-Type Pool Heaters - ✔✔A high-efficiency heater that makes use of the
condensate created by the burning of gas that allows for latent heat to be collected from
the vaporization from the water. Achieves approximately 95% efficiency.
✔✔Cyanuric Acid (CYA) - ✔✔1,3,5-triazine-2,4,6-triol; also known as stabilizer or
conditioner. Slows the destruction of chlorine in pool water by sunlight. Also reduced the
effectiveness of chlorine.
✔✔Diaphragm Pump (See also Chemical Feeder) - ✔✔Chemical feeder of the positive-
displacement type using a flexible membrane to move liquid through the pump head.
✔✔Diatomaceous Earth (D.E.) - ✔✔White powder composed of fossilized skeletons of
one-celled organisms (diatoms). Used as a filter medium for swimming pools.
✔✔Dichlor - ✔✔Sodium dichloroisocyanurate; a stabilized form of granular chlorine.
Usually 62% chlorine by weight and a pH of ~7 in water.
, ✔✔Disinfection - ✔✔The process by which disease-causing organisms are killed or
inactivated.
✔✔Equalizer Line - ✔✔A plumbing line from below the pool surface to the body of a
skimmer that prevents air from being drawn into the pump.
✔✔Erosion Feeder - ✔✔A chemical-feed device that creates a chlorine solution by
eroding granular, tablet, or pelletized forms of chlorine by flowing water past or spraying
water on the product.
✔✔Eye Burn - ✔✔A pool term describing irritation of the eyes due to rinsing off of the
external eye fluid or by chloramines.
✔✔Eviseration - ✔✔A medical term for damage to a person's digestive track caused by
suction of an uncovered or unprotected bottom drain.
✔✔Feet or Head - ✔✔A basic measurement of resistance to flow in a hydraulic system -
- equivalent to the height of a column of water that would cause the same
resistance/pressure.
✔✔Filter Cartridge - ✔✔A pleated element, usually of fibrous material, used as a filter
septum in some pool filters with a recommended filter rate of 1-2 gpm/ft2
✔✔Filter Cycle (Filter Run) - ✔✔The time of filter operation between backwash
procedures.
✔✔Filter Diffuser - ✔✔A shower-head-like device inside the top of a sand-filter tank
attached to the influent piping -- distributes the water evenly over the top of the sand
bed.
✔✔Filter Element - ✔✔A filter cartridge, or that single part of a multiport diatomite filter,
upon which the filter media is deposited.
✔✔Filter Media - ✔✔Any fine-grain material that entraps suspended particles as water
passes through.
✔✔Filter Septum - ✔✔That part of a filter on which D.E. or similar filter media is
deposited -- consisting of clotch, wire screen, or other fine mesh material.
✔✔Float Valve - ✔✔A valve controlled by the level of a fluid. Typically associated with
autofill systems that regulate freshwater fill or chemical-tank-level controls.
✔✔FLOC or Flocculate - ✔✔The process of agglomerating coagulated particles into
settleable flocs, usually of a gelatinous nature.
