Non-polarized doubler capacitor...can I change it?

[Electronic M]

Never heard the term "pump capacitor" so a schematic might help clarify.
Assuming the capacitor gets reverse polarity which would necessitate a non-polarized cap.

You can make a non-polar cap out of 2 polarized caps of the same voltage rating and twice the capacitance connected in anti-series (connect the positives of both caps together and use the negatives as the terminals that connect to the circuit).