How would i increase water velocity over pool chlorinator?

I have a pump, a filter and chlorinator, well 2 of each on separate water circuits.
the pumps dont pump enough water to keep the chlorinators making full amounts of chlorine on medium speed so I need to increase the water velocity through the cells. I think this is the issue as when the pumps are on full speed the output is fine.
running pumps at full speed uses a lot of power so want to keep using them on medium speed. anyone know how I would increase the water velocity that goes through the cells?? the input to the cells are 40mm pipe.


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