need help with ins and outs of Ca reactor

[christyf5]

Hey guys!

Well I've tried to wrap my head around this one but I guess I'll have to bite the bullet and show my ignorance when it comes to this techy stuff (oh wait, I've done that before )

I am in the process of attempting to convert my Berlin XL skimmer to a calcium reactor. Its been done by a couple of people on Reefcentral and it looks like it could actually work. The reason for doing this: its the cheap (ie. free) and what have I got to lose?. Besides I'd feel guilty for selling this POS to anyone anyway.

However, I'm not so good at this DIY thing. I'm really trying but I still can't seem to figure out how this whole calcium reactor works. I understand the logistics, but the picture one of the DIY'ers has provided I just don't quite get and there is nobody around here to ask, except for the cat and it doesn't seem to care that I want to build this thing

So, I've labelled a few important things in this picture. If someone could point out what is missing or what they do that would be great. I think mostly what I am missing is the water in/water out points.

Thanks

Christy