I just recently moved and the water quality here is garbage. I have a four stage RO/DI that has a membrane that's about a year old. I just changed the sediment filter and carbon to see if it will help but it didn't. My water is coming out with .02 ppm PO4. The DI resin is still in good condition (I have the color changing kind from BRS and only a third has browned out). At my previous location, I never had an issue with water quality. What do y'all think some options are?