Building a Calcium Reactor

[Stretch]

Well i've been throwing around the idea of building my own calcuim reactor for a past few weeks. Anyways I think i got the basic concept of my reactor worked out. Well I need too do this ultra cheaply So the reactor would need to be built out of PVC. Would this work just as well as arcylic? I wanna build it out of PVC because I'll need fewer tools, and PVC is very cheap. Also what kind of flow should the recirculating pump have? i plan on having the reactor height at about 24 inches and using 4 inche PVC.

Also any tips?