I wish I would’ve taken a pic before I changed it… Anyway, I have a BRS 4-stage RODI, been using it without changing filters or resin for a year. I only have a 20 gallon so it’s not pumping out a lot each week. I’ve noticed my silicates creeping up slowly in my tank, TDS always reads zero but I had read that silicates and some other things in water won’t show up on TDS readings? There’s always something new to learn lol. The DI resin was mostly the same color as it’s always been, only a portion on the bottom had changed colors, maybe the first inch or so. Also, when the system runs, the water level in the canister only went up about an inch, it was passing quickly through the resin. Now that I’ve replaced it, the whole canister fills up with water, as if it’s taking longer to squeeze through the resin. What’s normal and what’s not? Was it packed too loosely before and the water wasn’t being treated properly?