I am getting ready for my first home brew, ordered an all grain kit from mail order, all the eqiupment is ready and then I read Palmer's "How to Brew". Now I am at a loss. I don't have a water report yet. But I do have access to RO water, I use an RO/DI filter for my aquariums. So My question. After just the RO my tds is 6ppm after the DI it is 0ppm. Could I use the RO water and build the water profile from it assuming all parameters are zero? Or should I just wait until I get my water report. Just an aside, I have well water that has a tds of appox. 650. And no we don't drink the water without filtering it.