Soundproofing.

I insulated my sump with roofing tiles and use computer fans for the back of the stand for air movemtn. Keeps it quiet and cool.

 

That's probably a good one.. but my pumps are on the outside.

 

That's a new one.. terra cotta type tiles? I'm thinking I may use the new foam backer board called easyboard. I used in redoing my shower. IT's easy to cut and lightweight. I'll probably cut a small hole with a little fan for ventilation.

 

I would consider that if it didn't cost so much.