How to reduce a noisy shower pump

Edit Subject

Dear Tech Support,

I wonder if you can help answer this question.
I live in a Victorian house and have recently installed a shower pump in the bathroom.
The neighbours below have advised that they are affected by the noise.
The pump is currently sitting on the floor under the bath sitting on some a folded over bath mat.
The flooring is linoleum on top of the wooden flooring which is over old laven plaster.
We're not really in a position financially to take up the flooring and insulate so I was wondering what sort of effect buying your acoustic enclosure kit would have on the pumps noise transfer.
Many thanks for your time.