Concerning the Developer:

First of all, make a “tank solution” of Developer with this stuff.
http://www.bhphotovideo.com/c/produc...41SM_Tank.html


Than replenish (if you have to) take 13ml per meter of film by your replenisher mixed from the F1 Box.
http://www.kodak.com/global/plugins/...ls/z101_02.pdf

For intermittent use in a home hobby lab I would not recommend to replenish the developer. You will probably not have the continuous throughput to keep the developer stable. For bleach and fix, on the other hand, replenishing is fine and saves money. Usually the bleach is not only the most stable part but the most expensive too…

Regards, Stefan