Pulse width gadget to control pump speed

[sablesurfer]

This is what I am looking at to control my pump during recirculation. My little black pump actually runs a bit fast during mash recirc and rather than fiddling with ball valves I was thinking this would be a good way to control the speed.

Any electrical people weigh in on how this will impact the life of my pump?
(Controller first, then my pump below that)

http://www.amazon.com/gp/product/B00CW82ZPG/?tag=skimlinks_replacement-20

Product Description
Specifications:
Working Voltage: DC 6V - DC 90V (Ultra wide working voltage)
Control Power: 0.01 - 1000W(Max current :15A)
Static Current: 0.005A ( Standby)
PWM Duty Cycle: 0% -100%
PWM Frequency: 15Khz
Voltage control:0-5v(Voltage -mode control ,can use PLC to control the motor speed directly)
With power reverse connection protection, has complete protection from overvoltage, 20A to quickly fuse the ceramic fuse ,can use PLC voltage to control directly.

Package Including:
1 x Speed Control
1x Speed Control Switch
===============================

http://www.amazon.com/gp/product/B00E0FXR6K/?tag=skimlinks_replacement-20

Technical Specification:
* Material : ABS
* Voltage Range : 6V-24V
* Nominal Operating Voltage : 12V
* Maximum Fluid Temperature : 212
* Maximum Fluid Pressure : 145 psi
* Wire Size : Input two-wire line length of about210mm
* Operating Noise : ¡Ü 45dB
* Minimum Start-Up Voltage : 6V
* Maximum PV Panel Output Power : 15 Watts
* Maximum Head : 3m
* Maximum Flow Rate : 12L/M

 

[alien]

I've tried PWM with these little 12V pumps. These kind of pumps have brushless motors which is a problem for PWM. Bottom line was, I could get it to work with slower PWM (~1 kHz) but it was noisy. Faster PWM (~20 kHz) was quiet but it just didn't work for me. YMMV.

 

[kenh]

Add a buck filter after your high frequency PWM and it should work fine.