I use distilled water to mix my Pyro, I use tank water for everything else. I have a paper/poly filter first, this is to clear the water, the a ceramic charcoal filter to remove most junk from it, I process B/W C41 & E6 my results are great. There are pump and irrigation shops that sell filters, Davey have their own now. I replace the cartridges every few months. I use this water in the house for the dishwater toilet and washing machine. Since doing so the clothes and dishes are much better. I have had no issues.