So my first time using distilled water in a loop. Had always used coolants before. I filled with distilled, and then added a few drops of Inhibitor+ and Biocide+ to the res. Ran the loop for a couple of days and then used my pH kit to test it. Long as I'm reading it correctly, I believe I've got my pH at almost exactly 7. do I need to just automatically add a few drops of Inhibitor and Biocide every few months, or should I test my water first, and only add more drops when the pH starts to get off?