3d printed in multiple parts, there is the option for an attachment to hold filter socks in various ways, single, double long or double wide. Also an option for 7" sock and the one I am most excited about is the algae scrubber, algae grows on the white brick and when its full just take it out and put a new brick in no more cleaning mesh screens bleck. looking for feedback, what do you think ? the idea is water fills chamber flows out the front into chosed attachments, can even swap them out filter sock for maintenance algae scrubber, etc