Hello all! I am sure this topic has been discussed here. I'd just like some input here. I have an RO/DI filtration system under my sink. Normal sink faucet tap water is reading 219-223. After my sediment, GAC, CTO, membrane, inline carbon, and DI filter, I get a 0TDS reading for about a month. Then it hops up to 2-3. If I bypass the DI filter, I get a 11-13TDS reading. I'm on well water and it seems I'm burning through DI filters rather quickly. I have a water softer with UV light in basement. Should I add another DI filter? I'm frustrated and love an answer to help me fix this! Please and thank you all for your time!