Just to share my comments on this issue as a RM customer
I think before you start this thread, please give a thought for Joe himself. He is not an owner of a manufacturing company, or even mass produce his products.
Basically, it is more of a one man show or maybe he has some friends to help him. Like what he said, if all his customers were to call him to help setup or service the products, he would be running all over Singapore everyday.
Best he could do is to offer you the required help over the phone or guide you over a PM. I truely believe that Joe has a very valid reason not to help your friend personally but he would be agreeable to help out in any way he can.
And lastly, I believe that it is also your own responsibility to search and read up on how calcium reactors work as they mostly operate with similar functions. I have always believed in solving your own problems yourself and not to rely on others too much