How to determine low speed flow of 2 speed pump?


LifeTime Supporter
Jul 8, 2007
Portsmouth, Virginia
Looking at Pentair Dynamo 2 speed 3/4 hp pump. They give flow chart for high speed but no low. How can I determine if this pump can handle my pool on low speed without the flow dynamics of the pump at low speed? (I have already calculated total head and flow needs of my setup)

Head 25
100 sqft cartridge-flow30-35
15000 gallons 15x30



Well-known member
May 25, 2007
That's my understanding.

I belive head loss is too.

Fyi, I recently emailed Pentair for the flow chart on the 2 speed dynamo, they told me they don't have it for 2 speed, only one speed.