If you use (empty!) water bottles they have ridges along the sides and catch the sediment very well I find. If you want it to go flat, store with the tops on, but not screwed up tight - acts like a fermentation stopper.

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Regards, Jane
What sane person could live in this world and not be crazy? The creative adult is the child who has survived.
Ursula LeGuin
http://www.etribes.com/madderbat