My boss gave me a sourdough starter that I've had on my counter for a week. I"ve fed it with just equal parts of flour and water without wasting the starter in order to increase the amount. it has increased in the amount, but have I made the starter less effective? My starter does have bubbles and it also has some fluid on top. how can i get what i have ready to use?

  • I find this description a bit strange. On a standard feeding schedule, without discarding, you should have doubled the starter every day. For 7 days, you should have increased the amount 128 times - if the boss gave you 100 g to start with (a not quite full glass of baby food) after 7 feedings you would have 12.8 kg of starter. Is it possible that you used less than double the old amount when feeding, or fed rarer than every day?
    – rumtscho
    Feb 27, 2019 at 18:26

2 Answers 2


When there’s liquid on top your starter it past the really active stage (or you put too much water). If the liquid smells alcoholic, even more so but don’t worry, these beasties are practically indestructible.

You can rejuvenate it by adding a couple of tablespoons of the starter (after discarding the liquid) to equal weights(not volumes) flour and water. I tend to go 40g starter to 80g flour+80g water which I then use to make poolish every 3-4 days or so (which I then use to bake 2 loaves using ~500g of flour). Once I make the poolish, I remove ~40g of flour and the cycle goes on. Remember, no salt goes in the poolish(or starter for that matter)!

If you bake less frequently than every few days go slightly drier: 100g flour/60 water to 40g starter - your starter will stay active for longer but it will also taste more sour as you leave it. If you bake really rarely, like once a month, you can keep it in the fridge and rejuvenate as above a 2ple of days ahead of baking, discarding what remains of 40g.

Finally, if you are wanting to keep a starter with rye, disregard the above- rye tends to mould more easily so you have to be vigilant with your feeds (although you can just give your starter a rye feed every once in a while to no ill effects in my experience)


From your description it doesn't sound very active. The reason to discard some of the starter before feeding is so that you keep the acidity in check. How much you have at this point is unclear. If it were me, I would mix well, then discard all but a tablespoon or so. Feed with equal parts flour and water...a couple of tablespoons of each. Leave it for 12 hours, then build up from there.

  • Is bringing it down to a tablespoon before rebuilding that much more effective than, say, discarding half then building it back up it back up? I'm not that familiar with starters, so not disagreeing, just asking since it seems like a lot to toss
    – Megha
    Feb 3, 2019 at 2:57
  • I guess that is the smallest amount I would do, not knowing how much the OP has.
    – moscafj
    Feb 3, 2019 at 13:27

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