Thank you for writing to me. That is a great question. All heat pumps use your existing pool pool water pump. Most people have a 1hp to 2 hp pump in their system and that is plenty of flow for the heat pump to work at its' peak efficiency. The standard piping is: first the water pump, then the filter, the heat pump, and last the chlorinator before the warm water then travels to the pool.
I hope that helps and that I hear back from you soon.