I am looking to get away from batch sparging and I think I have settled on going with a HERMS system. But I have a couple of questions on their use. First, how do you know when your conversion is finished? I am guessing a combination of timing and an iodine test. Second, how do you manage\control the flow of wort? Again I am guessing that the pump has a variable speed, but I was wondering how you can tell what the proper flow rate would be.