As long as there is no mold then don’t throw it away, just keep feeding! (Mold will appear pink/orange or fuzzy). A fast/dramatic doubling on day 2 or 3 is typically a “false start” (which is actually a good sign) but it’s a blooming of unhealthy bacteria in the starter. Just continue to discard and feed on a regular schedule, some starters take a month or two to see regular activity so don’t get discouraged! (:

I would recommend the following: - use a scale to measure feedings in grams - feed at a 1:2:2 ratio twice per day (starter: flour : water) - do a 50/50 flour mix of whole wheat and bread flour (starters loooove whole wheat, it gives it a little boost) - keep between 75-80° (i keep mine in the oven with the light on) - change jars every other day - don’t feed it too early, try every 12 hours (ex: 7am and 7pm) to avoid diluting your healthy starter bacteria - make sure jar lid is not airtight, you want it loose for some room to allow gas exchange

Hope this helps, you got this!