mmdoug-- Mr. Richard Durso gets all the credit for his innovative solution to the drain noise problem. Another member suggested putting sponges in the overflow to quiet falling water. Bad idea, sponges collect fish goo and everything else, = nitrates! Try covering the surface area of your overflow box with ping-pong balls. Make certain the balls cover just the surface area and are not forced under water. The last thing you want is for a ball to get sucked into the intake of the standpipe.