What RO systems do yall use and what's your average ppm? Recently, I've been using the Puratek 150GPD Deluxe for about 3-4months, and have noticed my ppm has gone from 0-8 very steadily. I havent noticed any changes in my tank(s) and I figured 8ppm was too little of most things to seriously injure anything, however, I do like seeing it say 0ppm for that extra extra clean water. Any recommendations on how to maintain filters efficiently? ive heard just rinsing them out with RO helps a lot, but I was wondering if theres anything else I could do or that you guys do that works for you. for reference I live in San Diego so our tap water is far from the best...