Turnover time is best defined as the period required to:
Filtration Circulation Systems
Question · Easy
How deep before you need a trench box?
Short
A rectangular residential pool is 16 ft wide by 32 ft long with a 5 ft average depth. Using 7.48 gal/cu ft, what is the water volume?
Question · Medium
A 20,000-gallon private residential pool must meet the USPSHTC 2018 8-hour maximum turnover. What minimum circulation flow is required?
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A 24,000-gallon residential pool circulates at 50 gpm. What is the turnover time?
Per USPSHTC 2018, what is the maximum turnover time for a private (residential) swimming pool?
A-10A work includes residential spas. Spa circulation equipment is sized on which maximum turnover time, the same figure NAC 444.484 requires of public spas in Nevada?
A residential circulation system must deliver 60 gpm. If a high-rate sand filter is rated at 20 gpm per square foot of media, what minimum filter area is required?
A cartridge filter is listed at 0.375 gpm per square foot. What minimum media area is required for a 37.5 gpm design flow?
The primary purpose of a surface skimmer is to:
A rectangular residential pool is 18 ft by 36 ft. If one skimmer is required for each 500 sq ft of surface (or fraction thereof), how many skimmers are required?
ANSI/APSP/ICC-5, as used with USPSHTC suction-entrapment rules, limits water velocity in residential pool suction and return piping to a maximum of:
A residential suction line must carry 80 gpm without exceeding 8 fps. Using Schedule 40 PVC inside diameters (1-1/2 in. = 1.610 in.; 2 in. = 2.067 in.) and V = 0.4085 × Q ÷ d², what is the smallest listed size that stays at or under 8 fps?
Question · Hard
When a fully submerged suction outlet (main drain) is used on a residential pool, ANSI/APSP-7 and the Virginia Graeme Baker Act require which entrapment-avoidance approach?
A residential pool uses only surface skimmers for suction (no submerged outlet). How much of the design circulation flow must the skimmer system be able to handle?
Placing the circulation pump below the pool waterline so the impeller stays flooded is called:
A residential pump is selected from a manufacturer curve. The pump must deliver the USPSHTC design flow at the system's calculated total dynamic head (TDH). TDH is best described as:
USPSHTC water-chemistry practice keeps swimming-pool pH in which operating band?
Maintenance And Operation
Free chlorine in pool water is the residual that:
A residential pool tests 3.0 ppm total chlorine and 1.8 ppm free chlorine. Combined chlorine is 1.2 ppm. Breakpoint (shock) chlorination is commonly dosed at about 10 times the combined-chlorine value. What free-chlorine target is used for that shock?
Total alkalinity is low and pH is bouncing. The chemical normally used to raise total alkalinity is:
The chemical most commonly used to lower pH in a residential gunite pool is:
A simple field check that residential pool water is clear enough to swim is that:
A high-rate sand filter is commonly backwashed when the pressure rise above the clean starting pressure is about:
Superchlorination (shocking) of a residential pool is done to:
Cyanuric acid (stabilizer) is added to outdoor residential pools primarily to:
A newly plastered residential pool in Las Vegas fill water is very soft (low calcium hardness). If hardness is left low, the most likely plaster problem is:
USPSHTC and APSP residential spa practice limit maximum water temperature to:
The test method commonly used to measure free chlorine in residential pool water is:
A 20,000-gallon residential pool needs total alkalinity raised 20 ppm. Using the common dose of 1.5 lb of sodium bicarbonate per 10,000 gallons per 10 ppm, how much bicarbonate is required?
When winterizing a residential pool in northern Nevada, the circulation piping is commonly:
A gas-fired residential pool heater must be:
Accessories And Associated Trades
NEC 680 equipotential bonding of a permanently installed residential pool commonly requires which conductor?
A wet-niche underwater light in a residential pool must be:
A powered safety cover used as a residential barrier alternative is evaluated to which standard?
A concrete pool deck should slope away from the waterline about:
A gas or electric pool heater is protected from dry firing by:
A time clock or electronic control on a residential filter pump is used primarily to:
NEC 680.26 equipotential bonding for a concrete residential pool typically includes all of the following EXCEPT:
A manufactured residential diving board may be installed only when:
A residential pool slide must be:
A gas pool heater installed outdoors must have:
Compared with a gas-fired heater of similar pool size, a properly sized air-source heat pump typically:
Under NAC 624.150, an A-10A Residential Pools license authorizes:
Pool And Spa Business Laws
For a Nevada residential pool or spa contract, the initial down payment or deposit may not exceed:
Nevada law requires a residential pool or spa contract to be in writing, with the NRS 624.940 mandatory elements, when the contract amount is:
Who must apply for and obtain the building permits for a residential pool or spa project?
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