Here is an AC300 IIRC thats been modded (N0T MINE). You can see how the media basket was cut to form the gurad at the outflow spillway as well as the baffle on the side towards the pump. If you do not want to cut your filter media basket, you can use plastic mesh etc for the outflow barrier guard, and most any plastic for the other baffle, such as a CD case cut to fit etc. The baffles need not gbe sealed up perfect, just enough to hold it in place as any water bypas that youo may have will not hurt a thing., The idea is to keep turbulence down to a minimum and some sand away from pump impeller. ANy more questions just ask..