This is the layout of the 5,000 gallon test Pool
- Hayward 24" sand filter with 2" port backwash valve.
- FlowVis 2" flow meter/check valve
- Ozone system with injector
- Low voltage pool transformer for underwater light.
- Stub-out for solar or heat pump.
- Remote switching for pool light and fountains
- Local outdoor equipment lighting.
- 1.5 HP wet-end
- 1.65 hp Neptune variable speed motor
- 2" pvc piping
- At 25 GPM, the 24" Hayward Pro Series sand filter only has less than 2.5 psi back-pressure.
- Backwash when flow is reduced by 5 gpm on the flow meter.
- Not 10 psi increase.
Example of energy efficiency
Only 158 watts/hour
Only 158 watts/hour
Only 158 watts/hour
Utilizing a 1.5 hp variable speed motor, this system is tuned to only use 158 watts / hour of electricity.
Only 1500 RPM
Only 158 watts/hour
Only 158 watts/hour
The 1.5 hp wet-end is running at 1500 RPM.
Using the flow-meter, the pump is adjusted to operate at 25 GPM.
Flow meter
Only 158 watts/hour
Flow meter
The flow meter shows the pump flow. In this case, I wanted a system flow of 25 GPM.
For the 5,000 gallon test pool, this resulted in a turn-over every 200 minutes or 3-1/3rd hours.
At such a low energy usage, I decided to run the pump longer during the hot days (more swimmers).
Cost to operate the pump
Only 158 watts/hour
Here is a chart showing the cost of operating this pump.
For comparison, a 1 HP single speed pump uses approximately 750 watts per hour. This is 750/158= 4.75 times more energy per hour.
Naturally, you would get a faster flow using the 1 HP pump but remember, you can only get so much flow thru the skimmer, piping, filter and returns.