How often to clean sump/refugium

[Mikro]

Just wondered how often to do this task. I really have more of a sump than a refugium as all I have in there is a bit of live rock and chateo...

 

[spazthecat]

I clean my out with each water change. So, weekly. It doesn't take any additional time because I'm doing the water change from my sump. I just vacum out the crud that's accumulated.

Andy