Exam Questions And Correct Answers

CA C53 Swimming Pool Contractor Exam Questions And Correct Answers (Verified Answers) Plus Rationale2026 Q&A| Instant Download Pdf

• What is the minimum slope required for a swimming pool deck to

ensure proper drainage?

• 1/8 inch per foot
• 1/4 inch per foot
• 1/2 inch per foot
• 1 inch per foot
• 1/4 inch per foot

Rationale: Pool decks require a minimum slope of 1/4 inch per foot

away from the pool to prevent water accumulation and potential structural damage.

• Which type of pool filtration system uses a sand bed to remove

particles from water?

• Cartridge filter
• Diatomaceous earth filter
• Sand filter
• UV filter
• Sand filter

Rationale: Sand filters use a bed of sand to trap particles as water

passes through, making them common in residential pools.

• What is the primary purpose of a pool skimmer?
• Circulate water
• Remove surface debris
• Heat water
• Balance chemicals
• Remove surface debris 1 / 3

Rationale: Skimmers remove leaves, insects, and other debris from

the pool surface before they sink.

• Which chemical is most commonly used to sanitize pool water?
• Chlorine
• Sodium bicarbonate
• Calcium carbonate
• Phosphoric acid
• Chlorine

Rationale: Chlorine is widely used for its effectiveness in killing

bacteria, algae, and other pathogens.

• How often should a pool filter be backwashed?
• Every day
• Once a week
• When the pressure gauge rises 8–10 psi above normal
• Only in winter
• When the pressure gauge rises 8–10 psi above normal

Rationale: Backwashing is performed to clean the filter media when

pressure increases, indicating clogging.

• What is the recommended pH range for pool water?

A. 5.5–6.5

B. 6.8–7.2

C. 7.2–7.8

D. 8.0–8.5

C. 7.2–7.8

Rationale: This range ensures swimmer comfort, chemical efficiency,

and prevents corrosion or scaling.

• Which type of pool heater uses the sun as its energy source?
• Gas heater
• Electric heat pump
• Solar heater
• Oil heater
• Solar heater

Rationale: Solar heaters capture sunlight using panels and transfer

heat to the pool water, providing an energy-efficient option.

• What is the main reason for installing a pool cover?
• Reduce water evaporation
• Increase circulation 2 / 3

• Heat the pool naturally
• Filter water automatically
• Reduce water evaporation

Rationale: Covers prevent water loss, reduce chemical use, and can

also improve safety and maintain temperature.

• In pool construction, what is the primary function of rebar?
• Form the shape of the pool
• Reinforce concrete
• Drain water
• Circulate chemicals
• Reinforce concrete

Rationale: Rebar strengthens concrete, preventing cracking and

structural failure.

• What is the minimum depth for a diving area in a residential

pool?

• 6 feet
• 8 feet
• 10 feet
• 12 feet
• 10 feet

Rationale: Residential diving areas require a minimum depth of 10

feet to prevent injuries.

• Which component controls water flow to a pool heater?
• Pump
• Valve
• Skimmer
• Filter
• Valve

Rationale: Valves regulate water flow, ensuring the heater receives

adequate circulation without overloading.

• What is the main hazard of failing to maintain proper pool water

chemistry?

• Increased water clarity
• Corrosion and algae growth
• Reduced evaporation
• Faster filtration
• Corrosion and algae growth
• / 3