Variable-speed pool pump: less noise, but not zero vibration
Updated : · Piscines VP
At low speed, a variable-speed pump is much quieter than a single-speed pump. But it still vibrates on its base, and some speeds can make the slab, deck or shed resonate. Filter at low speed, avoid the speeds that resonate and isolate the pump from the ground.
Variable-speed pumps became the norm for good reason: at low speed they use far less electricity and make far less noise.
But “quieter” doesn’t mean “no vibration”.
Why it still vibrates
The motor is always turning, even slowly. That movement travels into the pump base and then into the surface. At some speeds the surface resonates: the slab, wood deck or shed floor starts vibrating along with the pump and amplifies the sound.
That’s why some owners notice a new pump is “loud at 2,000 RPM, but fine at 1,800”.
How to reduce the noise
- Filter at low speed as long as possible. Keep high speed for backwashing and vacuuming.
- Find the speeds that resonate. Raise the speed in small steps and listen. Avoid the ones that make the surface vibrate.
- Do the hand test at the speed that bothers you.
- Isolate the pump from the ground if the vibration stays.
We’re developing SOURDINE, designed and tested in Quebec on real pumps, at full and low speed. Get notified →
Single-speed to variable-speed?
If your pump is more than 8 to 10 years old and noisy, switching to a variable-speed pump is often worth it. Check with your utility for current rebates on efficient pool pumps.
Piscines VP installs variable-speed pumps in Laval and the Basses-Laurentides, Quebec.
Frequently asked questions
What speed should I run my variable-speed pump at?
Most of the time, a low speed for more hours is enough for filtration. Raise the speed for backwashing, vacuuming or a heater that needs more flow. Follow your filter and heater manufacturers' guidelines.
Why does my pump vibrate more at one speed than another?
Every surface has a frequency where it resonates. If the pump speed lands near that frequency, the slab or shed amplifies the vibration. Changing the speed slightly is often enough.
Not sure of the cause? Take the 2-question diagnosis →
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