Well, it looks like this is coming together faster than I expected. I'm getting a 20-25 gal chemical drum from work, and Just picked up a Rola-Chem peristaltic chlorine pump on ebay for $32 shipped. Go figure, I finally find a great deal on a pump and it just so happens to be specifically for what I'm doing. I'm going to wait to see what all comes along with the pump before getting anything else, but worse case, I'll need a check valve, injector, and some tubing.