Start with the pool. Size the system around it.
Enter the basic details of an existing pool to receive a general pump, filter, heater and salt-system sizing range.
Planning guidance only. Final equipment selection must be checked against the manufacturer’s performance data and the actual plumbing system.
Size my equipment ↓Your pool operates as one connected system.
The pump does not work by itself. It must move the right amount of water through the plumbing, filter, heater and sanitation equipment without exceeding the limits of any component.
Move enough water to operate the pool properly—without moving more than the system can handle.
A larger motor is not automatically better. An oversized pump can create excess velocity, noise and pressure while consuming more energy. An undersized pump may struggle to circulate, heat or clean the pool effectively.
Flow rate
How much water moves through the system.Flow rate is measured in gallons per minute, or GPM. Filters, heaters, salt cells and water features all have operating-flow requirements or maximum ratings.
Total dynamic head
How difficult it is for the pump to move that water.Pipe length, diameter, fittings, elevation and equipment create resistance. As resistance increases, the same pump produces less flow.
Turnover
A planning measure—not a pump size by itself.Turnover estimates how long it takes to move a volume equal to the pool’s water capacity. It helps establish a planning-flow range but does not prove that every area of the pool circulates equally.
Plumbing size
The pipe establishes a practical flow boundary.Smaller plumbing creates more resistance at higher flow. Long runs, numerous fittings and equipment positioned above the pool also make pump selection more demanding.
Equipment limits
Every component must support the intended flow.A pump may be capable of producing more water flow than a filter, heater or sanitizer should receive. The safest working range respects the most restrictive component.
Variable speed
Adjust flow to suit different operating tasks.Lower speeds can support everyday filtration efficiently, while higher programmed speeds can serve heating, cleaning or water features when additional flow is required.
Pool dimensions estimate volume. Plumbing and equipment location help identify resistance. Features establish additional flow demands. The result combines those answers into a general equipment range instead of relying on horsepower alone.
Build a general equipment profile.
You do not need every technical detail. Unknown answers will produce a more conservative result and may trigger a Prairie Blue review.
Size by flow—not horsepower alone.
Horsepower is familiar, but it does not describe how a pump performs against the resistance created by plumbing, filters, heaters and fittings.
Pool volume
Dimensions establish an estimated water volume and a baseline circulation requirement.
Planning flow
The selector shows a practical residential circulation range in gallons per minute—not a mandatory operating schedule.
System resistance
Pipe diameter, distance, elevation and equipment affect the flow a pump can actually produce.
Equipment limits
The selected filter, heater and sanitizer must all support the intended operating flow.
Understand the recommendation.
Pump class
A general horsepower class is shown for easier shopping, but the required flow at the expected total dynamic head remains the deciding specification. Variable-speed pumps provide more adjustment when actual system resistance differs from the estimate.
Sand-filter diameter
A larger tank provides more filtration area and usually allows longer cycles between backwashing. The filter’s rated flow must remain above the intended system flow.
Cartridge-filter area
Cartridge filters are described by square feet of effective filtration area. Oversizing generally increases dirt capacity and extends the time between cleanings.
Heater capacity
BTU input affects warm-up time. Pool volume, temperature rise, cover use, wind and outdoor temperature all influence real heating performance.
Salt-system capacity
The selector intentionally recommends a capacity above the estimated pool volume. Cold water, heavy use and sunlight can all change chlorine demand.
When to request a review
Request a hydraulic review for long plumbing runs, elevated equipment, attached spas, large water features, solar systems or unclear existing plumbing.
Transparent planning guidance.
The calculation bands are informed by published residential equipment flow ratings and engineering guidance. They are deliberately conservative and brand-neutral.
- Pump flow, head and efficiency guidance
- Residential sand-filter flow ratings
- Residential cartridge-filter data
- Heater sizing engineering data
Important: This tool provides preliminary residential planning guidance. It does not calculate measured total dynamic head, certify code compliance or authorize installation. Pressure vessels, electrical equipment and gas appliances must be selected and installed according to their manuals and applicable codes.