While waiting on a new RO/DI unit that I ordered to arrive, I decided to drop by the LFS I recently found (just moved). I’m about to start a natural cycle of my dry rock from my previous tank, and decided I’d get the RO/DI from the LFS and mix with salt to get started, and use the new unit in a week when I do the first water change. I asked the LFS manager/owner twice what their TDS meter was reading at. First time was told, “it’s always kept below 5” (already curious) and second time that “the filters were just changed today” (I wasn’t born yesterday but gave him benefit of the doubt — then tested the water with my TDS meter when I got home.) ~290 ppm. Terrible. Is it worth starting the cycle in the brute bucket with power head and heater with this quality RO/DI? I’m going to do a 100% water change in a week and none of this water will make it to the tank, I’ll be able to begin my cycle, but am I risking my tank before it even begins doing so?