EMD360 wrote:
I put the pump on blue rigid insulation but it is still a bit noisy.
I believe the pump noise is reduced most when the tank is physically in between the pump and all the RV's plumbing to absorb the pump vibration. Otherwise the plumbing amplifies and carries the noise wherever it runs. Bobbo did a great job installing the large blue tank under his sink, but it won't be effective in dampening pump noise. Our setup pictured higher up changed the pump sound to a soft low hum, just enough to notice when it is running. Before, our pump sounded like a sick jack hammer banging on the pipes.