One of the issues is the mounting bolts are still running through the floor. And IF they're contacting the floor at any point, then that transfers the noise of the pump directly into the structure. Putting the memory foam keeps part of the noise from transfering directly off the pump. The ideal way is for us to figure out how to completely isolate the pump from mounting to the floor--- I've seriously thought about a "box" of sorts mounted to the floor with the pump secured inside (to keep from moving around) with styrofoam, memory foam etc. Not only would this keep the pump off the structure but also encapsulate the noise within the "box".... AS LONG as you dont run the pump too long and let it overheat. Might be worth a shot.
FWIW, we used ours this past weekend and it IS noisy and can be easily heard from outside.
The only "CON" I see in getting the pumps too quiet is, you may inadvertently leave them running and not know it--- say on an empty fresh water tank?
Just something to think about.
Originally Posted by Ken in Pa
As you all know the pump can be very noisy. We bought the kit off of Amazon that has two soft hoses also mounted the pump on a 4" pc of memory foam. This seems to help a little.