Calcium reactor design.

[fishboy]

Here's a question for you guys who have made your own calcium reactors.

Is there any reason that the chamber has to be round? You could greatly reduce the cost by making it square (I have lots of left over acrylic).

I was looking at a PM unit and the water enters straight down from the top and exits at the bottom. There didn't seem to be any "swirling" in the chamber that I could notice.

Anyone have any ideas or thoughts on this?