Sorry to hear about the brace, hopefully you will get back up soon. Pump noise is difficult sometimes to correct. First thing is to use dampening pads underneath the pump. BRS makes good ones. Second point is to track and evaluate your PVC lines. Typically vibration will occur at points of contact to a wall or ceiling or floor. You can reduce this vibration by using rubber mounts or padding the contact zone. Rubber flooring materials or rubber sleeves can be purchased to dampen the noise. Other methods include building a box around your pump lined with sound proofing foam or sound proofing the pump room itself. Sound proofing companies make thick sheets of absorbant foam which can be used. In my case I have a hammerhead pump in my basement which could be heard into the upstairs. I was able to dampen predominately by correcting the points of contact. It is fairly quiet now and tolerable. Of course the type of PVC, elbows, line size reductions, etc all are well known issues I am sure you know about. Good luck.