Hair can accumulate in accessible waste fittings or reach parts beyond ordinary owner care. A pump does not eliminate the need for the shower's approved strainer.
What the observation means
Slow drainage can occur before water reaches the unit, so the location of the restriction matters. Do not assume the pump motor is the cause.
A useful next step
Use and clean the owner-accessible strainer as instructed without dismantling the pump or concealed pipework. If drainage remains poor, stop adding water and report whether other connected fixtures are affected. Avoid chemical unblockers and improvised rods.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.