I can't recall the last time I swapped out my RO membrane (probably around 4 years ago). I've noticed my outgoing TDS has crept up from a typical 1-3ppm to 3-5ppm coming out of the RO stage. Is this my indication to change the membrane out?
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You are still within specs for the normal membrane so you are probably good. It all comes down to costs at this point. The higher your tds the faster you will use up your DI. At tds of 2, you will get around 2200 gallons out of your di. At 5 tds you are only looking at 890 gallons from your di.
I have high CO2. I degas the water before going through DI