Originally Posted by Retired_AF
I'm will most likely put a sock over the mouth of the pipe going in if I can find one the right size. I know its added work to clean it, but hopefully it will cut down on the buildup.
You'll get mulm even if you have a filter sock, although it will take long for the buildup. The smaller the micron size of the sock, the less you'll get mulm but more often you have to change out the sock. Vice versa.
It shouldn't matter too much though. Good to give the rocks some washing every 3-4 months, depending on the micron size.